As others have said it sounds sketchy. My gut reaction is that she is in a physically abusive relationship. Not wanting you to come over, being "gone" for 2 wks, unusual behavior, it all makes me think she has a black eye or something. You mentioned a boyfriend and that she realized that he wasn't right for her.
I hope that this isn't what's happening, but If she is in this sort of situation I imagine she's confused, embarassed, and scared. I think just knowing that you care about her is important.