Have her shoot a lot of different pistols including .22's. I know, limited stopping power but, small, can be carried in fitted clothes, light and very easy to handle, limited recoil eases follow on shots and any gun is better than none if, unfortunately and I hope she neve does, someone needs one...
My Uncle, who I miss dearly, was a USAF Security Vietnam Vet, and his retirement business was a firearms store. He carried the usual, but he specialized in estate buys, English shotguns and niche things. Inevitably he would get the 'best gun' question. His answer was always; '..whatever you think you can assuredly draw and accurately fire, more than once, unexpectedly in the worst possible situation like arms full of groceries in a parking garage stairwell..'. That always stuck with me.