what's going on here?

Okay so there's this girl I've been spending a lot of time with in and between classes. There's been a lot of, what I perceive to be, signs of interest: eye darting, teasing/flirting, a lot of talk about mutual interests/passions/plans after graduation, making excuses to talk to me, lots of compliments thrown my way, even a little possible facebook stalking (liked a week old status of mine) etc. etc.

So, naturally, I ask her if she wants to hang out after class one day, she says yes and we have a pretty good time. She then tells me she found out about a hiking trip over break (one of our mutual interests) and asks if I want to go. I say yes, so then she says she'll send me the info for the trip.

Only thing is, she hasn't yet, and at this point I don't think she's going to, and so I'm not going to pester her about it.

So, is this a sign that she's not really interested and that I should move on or is there something more going on here?