Have a thing for this girl. Does she have any interest in me, or am I just crazy?

I met a girl the 2nd week into college (no shared classes and live in different dorms so we only talk on fb and if we happen to see each other). A few weeks back, I thought I was getting somewhere and then she just ignored me for a week. When I stopped saying hi to her, she started talking to me again. A few days ago I asked her if she wanted to see a movie with me. She said no because she doesn't have time with finals next week. I asked her if she would be up for it after the break and she said "yeah, maybe." When I was getting lunch a few hours later, she walked in, smiled and mouthed hi at me. She sat down at the table next to me with her friend but didn't turn to face me, even though there were about 10 other tables open. When she got up to leave, she turned to me, smiled and said "I'll talk to you later" (the way she said it I wouldn't really classify as flirty, but she never spoke to me with that tone before, let alone say goodbye when she left if we were in the same place).

Now for the million dollar question, am I just crazy, or does there actually seem like she might have some interest in me?