Why do you want to be her male GIRLFRIEND? You've been placed on the Friends Ladder (google "Ladder Theory" for more info on that). Just get over your infatuation and change your mindset to that of you being her girlfriend with ballzz and you'll stop thinking of her in a romantic/sexual sense.
Don't contact her unless she contacts you when she leaves for her parents. That way when you go weeks without contact you'll learn to be able to live without thinking about her 24/7.
Note: if she just wants to be your friend then start treating her like one of your male friends. I'm absolutely certain you don't think about your male buddies 24/7 and your male buddies don't contact you every single day to "chat" and use you for their emotional tampon.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion