She's confusing me...?

Alright, so there's this girl in my school that everyone likes. Girls are friendly to her, and guys always fall for her....I became one of them. I'm one of the few (maybe the only) that admitted my feelings to her... Through instant messages.... She made it sound like no big deal. Like she didn't care you know? We became really close friends after I admitted. Then, a few times in class I notice her staring at me. In science class, the lights were off and we were watching this thing, I was in-between my two friends in a conversation. And I was moving my head from side to side to face the speakers. On my left side when my buddy was talking, I think we met eyes, but unsure, I pretended I was facing my friend. And kept doing that...her eyes were still on me. For a science group project, her best friend who has a crush on me forced me to join their group. And you know we were working and talking, and then her friend asked her if she liked me. And she said that we were only acquaintances. As usual I looked un hurt. I was only scratched... And I still played my friendly games of teases and jokes and taunts and whatnot's. During the time they were passing out our graduation robes, she was behind me and leaned her self on me. (her boob was making contact with my elbow). Uncomfortable at the awkward touching, I shifted away. but then, she Just did the same thing again.( yes my elbow made contact with her breast again...) this confused me. I mean, I talk to her on AIM and she just usually sound all bored and not caring of what I say. Answers back like an hour later... There are a few times when I get a good fun conversation from her. She's not like this in person... Also, During our senior trip to six flags, she and her girlfriends picked me and 2 other guys to be in their group(12 people max) and I mean, I just got confused you know? I was about to join my friends but during a class where we were partners, she said I was in her group. So I had no say in it... She listed me down, I let her. On the lines of green lantern and eltoro, she said that I am sitting with her. She said it with like this "your not sitting anywhere else" kinda tone. She kept screaming "I'm gonna die!" which was pretty cute ^^ after that and lunch, (oh yeah. I should mention that there's not a day where I don't tease her or tell jokes and stuff. And she would usually laugh. I basically do this every time we talk). We road the Congo rapids and she was SOAKED while I was dry. When we went to the looses to get our stuff, she did the lean again. My elbow made contact with her boob for the third time... So you see, I'm very confused. Is she trying to signal something? I still like her. Probably will never stop. I keep thinking of all the times she leaned on me, all the times I catch her staring at me, all the times she basically touched me and I had to walk away from the awkwardness, and then, when I AIM her, she answers hours or at least 20 minutes later, usually answer with 1-3 words as if trying to end the conversation. What do you guys think? Does she like me? Or is she just pulling my strings? If she is... It's kinda working...