I've made Quinn an NPC. That's pretty much what's going to happen to most characters when their player has left. My only rule is that you should try to keep them in character if you're going to use them. She's currently headed for her room, but it would be okay if someone wanted to stop her and ask why she was so upset/annoyed. I'll leave it up to you if she decides to say anything or not. 

[@Pudding] Glad to see you'll be making use of your university's facilities! Like I said, I'll be taking it slow, so just check in and write when you feel it's appropriate.