I think you should let her carry what she is comfortable with. if she wants a manual safety, then have her train that, every draw she unlocks it and locks it back while holstering. Also just be glad she is carrying.
I would recommend you go to a range and see if you can try before you buy. In the case of SCCY, i had one. if you go that route i would recommend a trigger kit and a SCCY cpx 1 ( it has the safety) you can even get one with a red dot if you choose. But whatever way you go, try a range out first...