Are the pachmyer grips wider/fatter than the original grips that came on the PT99? If so swap back to the original grips.
If she likes everything on the G19 except for the weight or recoil, have her try out a G17 and see if it is any better for her. Yuck, I just recommended a Glock to someone, lol.
Keep trying till she finds something that she likes. If she doesn't like to shoot it, it probably will be much harder to keep her interested.