Does this girl like me?

There is this really cute girl I like that doesn't really talk to too many people, but whenever I ask her a question or something she gets really attentive, if I call her name (she sits infront of me) she whips her head around to talk to me. She also gets jumpy too. I'm not sure if this is normal behavior, I don't really understand the inner working's of womens' minds. Is she just being friendly or is she headover heels?