Girl sometimes shows interest other times kind of ignores me?

Anonymous
We're in the same class, some days she glances at me and holds eye contact, other days she completely avoids doing it. She shows some signs of interest such as preening, looking away first after eye contact and then looking back etc. We've been in the same class for 3 weeks now. I want to go talk to her, but she's always in a little group of 3 or 4 people. One of those people is a guy that she has no problems hugging and talking while laughing which kind of puts me off and makes me question what does she even want from me. Why would she be doing this?
Girl sometimes shows interest other times kind of ignores me?
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