Fantastic for your Mom. I know if the day comes ( hopefully a long time away ) that I can not handle 2 wheels, I will be on three. And for me the Can Am is the best bet. Heck I would not mind having one now as a 3rd bike, the F3 limited. Definitely much better cornering than normal trike. I see lots of them around here is SW, Ohio and often driven by women.My mom has a Spyder. I do have to say it's fun to drive. It's like driving a 4-wheeler. From what I understand they can handle the twisties pretty well but I scared myself going around a corner too fast (don't tell my mom lol). She loves driving it. She is not that great on two wheels hahaha.
When we were younger with dirt bikes she hopped on one and drove straight into the side of her own truck and broke her wrist. A few years later my Dad got her one of those fast mopeds that Yamaha makes and drove off into a ditch but no damage to her or the bike.
Now she has 3 wheels and I rode on the back with her drive after me having a few beers lol.