I would avoid a revolver. Especially for a woman.
Get her something with a clip. So she can reload if need be in the heat of the moment with more than one clip on hand. Better to have, than not have and need.
You can find a ton of guns without a hammer and as far as a safety release, look into Springfield. Where your palm grip, releases the safety.
Check this:
https://www.springfield-armory.com/xds-mod2-9mm-features/
My carry instructor told the class a story where for years, he only carried his piece, no extra clips. One day his next door neighbor called him, frantic on the phone, hidden in her closet, her husband was away and her and daughter heard someone in the house.
Ended up, no one broke in, but he said ever since that day, he thought about it after and said what if there were 2-3 robbers in the house and they had guns and he's going in with his gun with 8 shots. He said it made him feel so dumb after. But luckily nothing happened. But now he carries two extra clips.
Two cents...