How do I interpret these mixed messages?

First, some backstory: I’m currently at a summer ‘pre-college’ session, with about 2 more weeks before I return to my home on the opposite side of the US. About a week ago, I met a wonderful girl, and we’ve been hanging out pretty much every day, as often as our schedules allow. We’re both staying in the same dorm, which means that we see each other quite often (hung out with her 3 times just today).
Anyways, I really like her, and she’s been relatively intimate with me (handholding, frequent hugging, generally physical actions that point towards her liking me a lot as well).
The thing is, she’s also in a relationship right now, and it’s her first one to boot. She seems to be deeply in love with her boyfriend. While she has only seen him three times in three months since she began her relationship with him, she obviously adores him.
The way that she’s been acting towards me confuses me in this context, she’s a bit more physical in the way that she expresses herself than most people, but I’m her closest friend by far right now. If it wasn’t for the fact that she talks about her boyfriend from time to time, I would say that we act like most committed couples do, minus kissing. What do you think is going on? Is she simply seeing me as a unusually close friend? Or does she want something more? what should I do?