Get her this. It does what you want
Get her the Charter Arms 22 Pathfinder Combo. It is double action and shoots both 22lr and 22 magnum. She can practice with one and carry with the other. Its the cure for this issue, and she will like it a lot. Its a bit pricey though compared to the other 22 revolvers on the market.
Personally, I think carrying Magnum calibers is wisest. Most semi-autos just don't have the umph to penetrate, particularly the prefragmented or hollowpoint versions. I prefer a heavy fast FMJ flat nose or ball. In the smallest of calibers i think this concept is what works. In 22,25,32,380,9,40,45 you need more speed and energy to reliably expand a hollowpoint.
If It doesn't have the word "magnum" in its name then it should be FMJ flat nose or ball.
I know this statement will step on some toes but who cares that is why this is a forum. I'm just trying to help.