Okay, so ask yourself if she seems like the person who does things like that. Maybe she likes you and just wanted you to notice her more. Try to look around and see if she acts like that towards her friends and other guys. If she doesn't and has an "alternate personality" around you like you said she acts kind of wierd, then I'd say she likes you. If I were you, I'd ask her friends something like, "Hey (friend's name), what's up with (girl's name)? She's been acting kind of funny lately around me, what's up? Is there something wrong?" You can probably come up with something that sounds a little better, but this is just off of the top of my head.
I agree with scifi_aaron and that she is a little uncertain right now, but just carry on your normal life and if she does something else, then she likes you.
Good luck to you! :D