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Open Question: need some help about a confusing girl?

This is a long question. If you don’t feel like reading, then don’t. if you do, then thank you very much for your time.

there's this girl in a couple of my classes that is really cute and i like her. I never talked to her the first semester because i was shy, but this semester i manned up and finally talked to her. at first i thought things were going well- she seemed comfortable with me, having good conversations, laughing. she started to sit next to me during lectures and classes but she sort of keeps to herself, never really getting close enough to accidently touch me, kind of has a closed gesture. lately our conversations never really go beyond school topics and when i do try to go beyond school she gives brief and/or uninterested responses. whenever we see each other outside of class she gives me a half smile and a head nod- the kind you give to someone you just acknowledge.

We had a little study session together the other night to study for a quiz and we ended up just talking about different stuff for about 30 min. she seemed somewhat excited to study with me when I texted her that night and the morning of so I thought that was a good sign. then today when she was going into the building (I was quite a ways away behind her) as she opened the door she looked my way, saw me, and the quickly turned her head and walked away; but when that class started she sat next to me. Also, on her facebook page she has a bunch of pictures of her and this guy hugging and cuddling, but they aren’t hooking up or anything and she doesn’t have a relationship status up on facebook.

but whats weird is that she seems like she’s starting to not be into me, but she still sits next to me in classes even though she knows other people to sit next to. My friend says that the fact that she sits next to me and went to the study thing with me means that she likes me, even though she has a bunch of pictures on facebook with that other guy. She gives me some body signals that she likes me like dilated pupils, playing with her hair/moving it to the other side of her face so I can see her face and preening, but I’m starting to think that those body language tips are bullshit.

I asked her if she wanted to get lunch with me today but she said she couldn’t because she always eats lunch and dinner with her friends and that if she didn’t then she would eat with me. I’ve complimented her on a piece of jewelry she had, which I actually liked, and she just said thanks like she didn’t care what I said. I don’t get why she sits with me when she doesn’t seem that interested in me. She doesn’t seem like the shy type cause she has tons of friends and goes out just about every night, but idk maybe she is around someone she likes? She even became a fan of a frat that I’m pledging on facebook even though she said she hated that frat-why would she do that unless she likes me, right? She’s really confusing me.

I don't understand why she keeps sitting next to me. she doesn't really add to the conversations, sometimes she'll wait for me after class and sometimes doesn't, im so confused. The other day in class I leaned away from her for most of the class and it seemed that she was playing with her hair more and she would lift her leg closest to me and bring it down kind of hard so that it would make noise. When I leaned back towards her she stopped doing those things and talked with me on the way back to the dorm. When we sit together in class she seems fine when our arms lean against each other and doesn’t move when they touch and sometimes our feet/legs get close to each other, but never touch.

My gut says that she likes me, but some of these things make it seem like she doesn't... I'm so confused

So my question is do you think that she's attracted to me or am I just a classroom buddy? thanks for the answers.