Ditto, my problem is that I have all other quests done to max progression, so Rachel is happily studying in her room in the buff, plugged with a cat tail and I can't find any other hints anywhere that might help. Went through 3-4 weeks checking in on her just to make sure, no dice.
Another point:
What I did find by pure chance alone were the Twins making mischief in the cafeteria, arriving dirty and having to wash, then end up doing their shift in an apron only. There was nothing indicating that there were any "random" events undiscovered, please leave at least a hint somewhere of open events. While the game IS fun and exploring is fun as well, when you're replaying the same stuff for the umpteenth time, it gets boring, no matter how good it was at the beginning.