I don’t know, M seems to have some anxiety and maybe she’s having trouble finding friends. I know for many, this homecoming weekend thing would be super fun and a way to go out and meet people, but for someone who is an anxious introvert, it would be a nightmare. She might get her groove soon, she might not. Dorm living isn’t for everyone.
I actually wouldn’t be surprised if Sarah encouraged her to go for content even if she didn’t want to with the promise she could come home every weekend.