I recently noticed that while playing a certain family in Sunset Valley, the father's mother was not in the same neighborhood as him (greyed out at the far right) and when I switched to his father and initiated the "Invite to Visit" action, I caught two university roommate names (Jonathon Dirk and Antwon Thayer) indicating she went to university and yet I see no house with her in it when I go to Edit Town of the university. Dorms are not possible since that encompasses 8 Sims and it can't be a fraternity or soronity since there's both genders involved.
Any ideas on how to get her back to Sunset Valley? Also, this is the first time I've seen an unplayed Sim enroll in university (always had to manually do that myself).