Why do her and her friends keep looking at me?

So for some reason there's this girl in one of my classes who seems like she really wants my attention. She'll be loud and keep looking at me, but she only does this if I'm far away. If I'm close she gets really shy and avoids looking at me. However though recently she's begun complimenting other guys and her friends and her will look over at me just to see my reaction. If I look her friends will whisper something to her. And on top of that even out of class her friends will watch me sometimes. What's going on?
Why do her and her friends keep looking at me?
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