Hot tub theory -- season 2, episode 9
The publicist (Eden) seems like a sneaky lady. She knew Helen and Whitney were going to be around on the college tour and didn't mention it to Noah. Could have been an oversight, but what if she was hoping to 'rev him up'... the look on her face when she came to his room with the bar fight (well, almost fight) video even as she was telling him not to do it again, combined with the glee she found at spinning it... It just seemed like she spun the whole movie deal out of it, she thrived on the controversy.
What if she knew, managed, manipulated events so that Whitney would be at the party? She made the 15-minute head start to the bedroom in order to give Noah time to run into Whitney. She wouldn't know the result exactly, but it would certainly generate more chaos. The chaos she thrives on.