I second that suggestion.
I'd recommend a S&W Model 10 snub because it isn't too big, but has enough weight to make it a very gentle shooter.
My old man couldn't rack the slide on my Makarov pistol due to arthritis, but he shot my K-Frame .38s just fine when I took him to the local range.
Oops, I just noticed that she is looking at a gun she can carry. A Model 10 could be a purse gun, but she'd have to try one out to make sure it wan't too big for her.
Here's my Model 10-5.