im not stalking, if I was stalking wouldn't I be trying to go to her house and sit outside of her window or something?
From the Wikipedia entry on "stalking": Stalking is unwanted or obsessive attention by an individual or group toward another person. Stalking behaviors are related to harassment and intimidation and may include following the victim in person or monitoring them.
I am not saying that looking at her FB was wrong. I am also not saying that you don't have a right to be hurt that she blew you off. What I am saying is, confronting her about her whereabouts that night crosses a line into stalker behavior.
Considering that it sounds like this woman isn't even sure she wants to be in a romantic relationship with you two, you would be smart to just mellow out.