'A Woman of No Importance,' by Sonia Purnell, written about Virginia Hall. Hall is a bit of a personal hero, and there's so much facepalming to be had over the behavior of the men surrounding her at the time. She was an important espionage agent in occupied France, very capable, very smart, who was chucked into essentially an impossible mission with practically no resources...and figured out how to thrive at it.

Editing to add: Also, this isn't a book, but look up 'Wartime Farm' by the BBC. It's a TV series (one of several focusing on different time periods) where historians and anthropologists try to recreate the lifestyle of people living in an agricultural setting in a different era. And they do quite a lot to put it into context, so touching on things like the home defense training, secretly utilizing 'farmer's wives' to operate communications, things like that, as well as more obvious things like the impact of rationing and the ways a nation scrambled to return to producing enough food to support itself when the supply chain from outside the island was cut off. A LOT of women's work went into the war effort on the home front. Also, Ruth Goodman is awesome.

Persephone Books is a small female owned publisher that focuses on out of print 19th and 20th century woman authors. They have a good selection of books about WWII which you can find here, a mix of fiction and non fiction.

I highly recommend The Unwomanly Face of War by Svetlana Alexievich

A Woman in Berlin is a diary kept by a German woman in the days after Berlin fell to Soviet soldiers.

This isn't exactly what you asked for but the U.S. Library of Congress has some amazing materials.
https://www.loc.gov/

Some about women who served (in their own words, on video), or were journalists, or were "Rosie the Riveters", etc.

I know you aren't looking for a project, but Assisted Living homes are full of women who were kids, and they would LOVE to talk about what they remember. Hungry in fact to share their stories. They won't be here forever, it makes me think about collecting more of them.

PSA: Before Grandma is gone, take out the phone and interview her.

"Gone to Soldiers" by Marge Piercy is set in the WWIi throughout the whole war. It focuses more on what happens to women - in the war and on the home front - than most books about WWII.

If This Is a Woman: Inside Ravensbrück, Hitler’s Concentration Camp for Women by Sarah Helm Is good. Not an easy read though (emotionally).

I second "Woman of No Importance." There's a novel that also goes into Hall's story: "Invisible Woman" by Erika Robuck. She also wrote "Sisters of Night and Fog" that describes the Ravensbruck concentration camp. Kate Quinn has written several female-centric novels of WWII based on historical events and people: The Rose Code, The Alice Network, the Hunter and The Diamond Eye.

My mother is a big WWII fan and she loves Helen MacInnes's espionage books (her husband worked for MI6), many of which take place during WWII (her favorite is While Still We Live, written during the war, about the invasion of Poland).

From the Canadian side of things:

Dickson, Barbara. 2015. Bomb Girls: Trading Aprons for Ammo. Toronto: Dundurn Press. About the women who worked making fuses at a munitions plant outside Toronto.

Pierson, Ruth Roach. 1983. Canadian Women in the Second World War. Vol. 37. Canadian Historical Association. A monograph, which she subsequently expanded into a book, Pierson, Ruth Roach. 1990. “They’re Still Women after All”: The Second World War and Canadian Womanhood. Toronto: McClelland & Stewart. She elaborated on her thesis that the changes in the Second World War years were not as transformative or liberating as they were commonly assumed to be, since women's involvement was carefully constrained to minimally perturb gender norms, assumed to be 'for the duration' and reversed as quickly as possible.

A more recent treatment of the Canadian picture, Glassford, Sarah, and Amy Shaw. 2020. Making the Best of It: Women and Girls of Canada and Newfoundland during the Second World War. UBC Press. It's a collection of essays, which expanded the treatment beyond the usual Anglophone Protestants to bring in Jewish and French-Canadian women, among others.

If you're in the mood for shorter but still quality fiction, Holsinger, M. Paul. 1995. The Ways of War: The Era of World War II in Children’s and Young Adult Fiction : An Annotated Bibliography. Metuchen, N.J.; London: Scarecrow, takes you from the war years up to the early/mid 1990s.

Not women, but girls autobiographies

So Far From the Bamboo Grove

Touch Wood - A Girlhood in Occupied France

And of course Anne Frank

Nella Last's War is fantastic. It was also made into a film titled Housewife, 49. https://www.amazon.com.au/Nella-Lasts-War-Diaries-Housewife/dp/184668000X

I really enjoyed Code Name Verity. It's about two young British women: a spy and a pilot. It also had a lot of information about the sources the author used to write the book, so it could lead you to other books!

This website, A Mighty Girl, is focused on youth but has a lot of adult recommendations as well. It's intent is telling girls' and women's stories to help raise strong and resilient girls. A counterpoint to the disney princess looks-focused general culture.

WW2 propaganda films such as 'Millions Like Us' and 'The Gentle Sex' showed women entering the factories for the first time, working on farms in the Land Army, managing with rations, and what their social lives were like. They were made to help women get over the culture shock.

https://www.youtube.com/watch?v=4_qNiGjbMhg

https://www.youtube.com/watch?v=vHwynDT8cg0

Juliette Gardiner - ‘Wartime Britain 1939-1945’. It focuses almost totally on the home front and so covers quite a lot of women and women’s issues during the war.

Dorothy Sheridan - ‘Wartime Women: A Mass Observation Anthology 1937-45’. It’s extracts from specific Mass Observation Project diaries written by women at the time and it’s very good.

Simon Garfield - ‘Our Hidden Lives: The Everyday Diaries of a Forgotten Britain’ is more extracts from Mass Observation, some including women, but this time the end of the war and postwar period.

‘Ourselves in Wartime’ is, I think, a British government produced book? I can’t actually find an author or editor’s name, but it was published by Odham’s Press, London, and looks to be a 1960s book. There’s a section on Housewives at War, and also women are mentioned at length working both in factories and in uniform, as well as the home front, in churches and in entertainment.

The Women’s Research Group of Coventry have published a number of books on women in the city, and I have ‘Hurdy Gurdy Days’ which talks about women at the beginning of the twentieth century in the city, including one woman, a teacher, who risked a lot of trouble for refusing to celebrate the Empire and militarism.

I know there’s at least one academic paper published on women and prostitution in WWII, but I don’t have a copy of it or the details atm, I’m sorry.

Any of these useful at all?

The Maisie Dobbs series by Jacqueline Winspear starts in the interwar period with flashbacks to WWI but several of the books in the latter end of the series are in WWII. It is a great series anyway. Winspear also has a standalone novel called The White Lady which is about a woman spy in WWII. These are historical works by a living writer.

There is also a book called Millions Like Us: British Women's Fiction of the Second World War by Jenny Hartley which is a good starting point for exploring books actually written in the period.

Olivia Manning's The Balkan Trilogy and The Levant Trilogy are about a couple, based on Manning's own experiences during the war.

For anyone reading French there is « Être femme sous le IIIe Reich » (Being a woman under the 3rd Reich) by French historian and feminist Rita Thalmann.

Life After Life by Kate Atkinson

https://www.amazon.com/Rape-Nanking-Forgotten-Holocaust-World/dp/0465068367

I just finished reading this one a few weeks ago. It's about the Rape of Nanking, and is written by a woman. It covers the historical event as a whole, and has a lengthy section about a German woman who saved a lot of lives.

I haven't read this but it's been recommended to me:

https://www.goodreads.com/book/show/2728527-the-guernsey-literary-and-potato-peel-pie-society

This is a bit earlier, but I found the Maisie Dobbs books fascinating as a women's perspective on the aftermath of the First World War.

I haven't read the full series so they may eventually extend into the Second World War (she has written 18 of them).

I remember very fondly a book about a poor woman just after the war trying to build her life alone, it's German though and written by a man, Tim Uwe: die Entdeckung der Currywurst