Ticked over myspace?

My "bff" got angry with me because I moved her out of her spot on my top friends. I rotate my friends usually so that it creates a different appearance (I hate the same boring thing). I'm uming that after she discovered the move she went comment stalking (looking at other ppl's pages to see if I commented to them about something) and found out that we were going to a local bar this Saturday night. Plans have not been set into place but she's all bent out of shape because we didn't invite her. Last weekend we had a party for my brother (also her roomie) and we decided not to invite her, so she invited herself. Her ex was there (a friend we know from HS) and she made him feel so uncomfortable he left and after that she called us all traitors for inviting him. She hardly ever invites us out with her but she gets ticked when we don't invite her and then tries to dictate who we are friends with? I'm confused, someone help! She claims to be extrememly laid back, so why the diva-tude?