Let your mom pick the gun. Just make sure it's reliable, and in a good caliber. I myself think glock is a good brand, however, your mom might not like them.
Also, even though you probably already know the rules of gun safety, here they are:
Rule 1: Always treat all guns as if they are loaded, always, even when they are empty.
second rule: never let a gun point at or close to anything you don't want destroyed
rule 3: finger off the trigger until ready to shoot
4th rule: always know your target and what's behind it. Make sure little Johnny isn't behing that bullseye, and that that deer isn't someone in a deer costume.
I'd hate to shoot someone if it's too dark to see anything.
There are some times when you can see the target and not the sights, or, if someone breaks in and you and everyone in your house is in a safe room.
They settled on a Subcompact Glock 26. The recoil is very manageable
I like glocks. Especially subcompact glocks. First handgun I ever shot. However, I'm not sure this would be the best option. The grip is small, I don't think I can get more than 3 fingers on it. It will often, especially with the grip extension, "bite" my hand. The recoil doesn't hurt too bad, however, the rise is terrible. Follw-up shots are not going to be fast until you get in some good practice.