Except if Grandma can’t keep her wrists from flopping about like wet noodles, it’ll have a hell of a time cycling and she might not remember how to do malfunction clearance in the heat of the moment. With a revolver, she can just pull the trigger again.
I experienced this first hand while AI’ing for a local small time training company running a CPL class. An elderly gentleman had a hell of a time getting semi-autos to cycle. HK, Glocks, Berettas, you name it. He had some hand strength issues and couldn’t seem to keep his wrists stable to save his life. We could effortlessly get him through basic drills on the line with K frame and he was able to roughly get the same quality hits with it as he was with a G17.