Argh Girl Problems?

This is really starting to annoy me the hell out of me now, i really like this girl but i dont know if she likes me. We are doing exam currently this week and everytime we are allowed to talk she is looking at and sort of loooking away giggling, she has been doing this for a few weeks no in the corridors and stuff, the problem is she is friends with my enemies. Im quite confused it is starting to bug me i want to ask her out but i really shy and scared of the response i may get !