This still haunts me, but why didn't she accept my apologies?

So there's this girl that I know, I had invited her once to prom, but she sadly turned it down for a really close friend was in town and she devoted that week to her and they were going on a trip that weekend of prom. I only wanted to be just friends by the way. Also to add, later, when she was back in school, I asked if she had a Myspace and that I was deciding whether or not to make one and if I do, I might friend request her. But instead of saying yes she does and give me her myspace address, no, she says she does, then turns around and asked if I wanted to be more than friends and if so, we could start dating asap. Well I didn’t really like her in that way, so I just said no and walked off. Later encounters (total of 3) she seemed annoyed at me, or pissed. And one time when I tried to apologize, she switched it where I was supposedly the one that digs her and that she was trying to be nice and that she has been trying to land hints that she isn’t interested. When I laid down the facts that was impossible because we rarely see each other, she got stuck on that one, then turned around and said she liked it like that. But then I questioned why she acting like that and to tell me the real problem. She said she didn’t want to. Then she rushed to the bathroom and was in there breathing heavily. Then I purposely tried to get an answer stating no one was near and we could talk. She said that the only thing I needed to know was I’m her problem and that is all. I turned around and apologized to her about me rejecting her, that I may have seemed rude. Well I didn’t realize that people were around, and she gave me a nasty look and walked off mumbling something (it almost sounded like “that didn’t happen”) but wasn’t loud enough to really hear, but in a way that seemed as though she was humiliated. Then I brought up the fact that if its anyone who is liking who it’s her, and I brought up the facts, and again, she went straight to the bathrooms breathing heavily again. I decided to leave when I heard her almost cry. But why instead of accepting my apologies and move on, she tried to twist this crap on me? Is this a sign of low confidence?