I have a fun-sized wife and she likes the RTF Glock 19 with SSvi Tyr Trigger and Wilson 9mm 1911. Made the swap from carrying a P228 and P01 because of her smaller hands and DA/SA trigger. I also have a Gen4 G17 and she got me a Vortex Venom to put on it and with no backstrap she can shoot it but says she likes the metal triggered guns and sliding 1911 trigger.
I'd recommend a polymer framed striker fired gun (glock, M&P, P320, etc) and keep in account the trigger shoe.
Good luck!