What should I say to this girl so I can see her again..she may have a boyfriend?

Last week I went to visit my friend at college and I met this great girl. My friend's gf was visiting and she brought a friend from her school with her so it wouldn't be weird for me. At first she didn't pay me much attention, but when all of us went to a dance/halloween party she took my hand and started grinding on me like crazy. Whenever we left the dance floor she held my hand until she had to let go. We went outside for a little bit and it was kinda cold so she put her head on my shoulder and I put my arm around her. I gave her a couple of compliments also. We went back to my friend's dorm (she held my hand basically all the way) which is a quad. My friend and his gf were in one bed and his roommate was in one. There were 2 other beds and she was obviously tired cuz she got like right into one of the beds. The other one had crap all over it and I really wanted to sleep with her so while she was semi-sleeping I rubbed her back and said "You want some company?" She said she did so I got in and she took my hand and put my arm over her. We pretty much cuddled the whole night and she did things like rub my arms and legs with her fingernails and she even rubbed my a little bit. I stoked her hair, maged her back and rubbed her arms and also kissed her on the neck once or twice. The next day I said goodbye to her and that it was great meeting her.. She said the same and then we hugged and I said keep in touch, you have my number. I've texted her once since then and talked to her a little bit on Facebook (she added me) I really want to see her again, but she goes to college like an hour and a half away from me. It's no problem for me to go down on the weekend, but idk how to say it without sounding weird. I want to call her also, not text. My friend's gf told me she had a bf when I asked, but even if she does it can't be that serious.. she was completely sober.