Why does she act nervous around me ?

I think she may like you... that's exactly how lots of girls act when we like someone. The fact that she stares at you when you're not looking... she's interested in what you have to say. I think she's probably a little nervous and guilty for prejudging you before and doesn't know what to say now because of the way she was before! I don't think you're reading too much into things, I think there's a high chance she likes you but we can't always be sure ♥