My wife has trouble holding an AR up, she also has trouble with the slide of an automatic, and the hammer of my ruger .357 revolver.
I’m thinking of a 20 ga double barrel for her.
When I was in the Navy I went to the range with some of our sailors and a handful of M-11s, the SIG 228 in 9mm. I was surprised how many of the women had troubles pulling the double action trigger.
See if you can get her to fire and load a Kel Tec Sub 2000 in Glock 9mm configuration. Or, the .40cal version. 33 round mags, Glock reliable, but a light carbine with smack. I shoot 147 grain 9mm in my folder. You can mount a suppressor on them, too.