Confused about how she feels (long story made short)?

Met a girl thru a website for freshmen (kind of like myspace or facebook, but it's ran by our school) She sent me a message saying "hi just trying 2 make friends you seem cool etc" we messaged each other. talked about cl etc. I helped her w/her homework @ the library. she needed help 4 a test & said she'll take me 2 her house & we can study there (we could've easily met at the library again). We never really talk per se. we'll see each other around campus and stop for a bit to "check up" on each other. she texts me or sends me a message periodically again checking up on me (the messages always have !! and smileys, but i know that is how she is). this summer she hit me up again. we talked about how bored we were and she said i could come and visit her one weekend. i went over there (ended up spending the night). We talked all night about any and everything. she even opened up a little to me dont know if its platonic or if she likes me. any advice? would write more but there's a limit