I... don't like the girl he grouped up with.
Makes me remember horrible memories from Uni where similar kid I picked up and tried helping nearly got me and them expelled... TWICE. Because they couldn't handle having common sense or being cautious when dealing with stuff they really shouldn't have been dealing with in the first place!
It is one thing to try to be good Samaritan, but when someone drags you this far down, I see no reason not to cut off support, maybe not connection, but support. I also have life, and they literally cost me 2 years of uni. Even if I care about them, there are levels of AoE damage that I cannot abide to, and this girl in the story is waking up those horrible memories to me.
Sure, she may have inherent superpower that will blast beyond imagination, but realistically, no matter how nice as a person someone is, if they are dragging everyone down with them, I ain't gonna be there for them if it will cost me all my work as well. I learned that the hard way the first year in Uni where 2 in the group I worked with just... up and disappeared month before we were supposed to hand the final essay...
She is definitely not the latter type, but she is without doubt the former. There is a limit to being a klutz.