Is she a friend or a fake??!?

i started being "friends" with this girl like a month ago..she doesnt really text me or call me..she doesnt talk to me in school...but she asks me to chill and asks if she can sleep over and stuff..u think she is embarrased to talk to me in school...or she just wants to use me...she started talkin to me when i told her i got drunk at a frat party at my sisters college