You must let her pick the gun!!!
Based on her limitations, I would suggest she try a Bersa Thunder 380. Thin, light, great trigger, full grip, slide is easy to pull and won't beat her hands up. My wife carries one and she is deadly accurate with it.
The other suggestion is a used Model 10 or 64 2" because they have great triggers and no slide to pull. My wife loves shooting Smith K-frames and with the heavier weight is easier for her to shoot.
Appendix carry works well for many women. I'm at a gun show this weekend and 3 women customers choose a Minimal Clip to carry on their body in appendix location.
Hope this helps.