Seems a shame that a wheel gun is the only way to go. The first thing that came to mind reading your post, and the problems your mom has with the trigger of revolvers is what I carry a lot down here in the tropics of Florida;that is my little Sig p238. Good trigger, mechanically sound, very little kick, accurate, and, for me, trouble free. I have shot over 1k of all brands of ammo with nary a hiccup.
I have a no-dash 60, and as smooth as the trigger may be it could still be too much for a little lady to be comfortable with.
Just a thought. Much luck to you and mom finding something suitable.

jc