She keeps staring but won't talk to me, what gives?

We rarely see each other and she'll go from staring me to pretending I don't exist by social butterflying with everyone but me, then I'll catch her staring again. I try to start conversation with her, and she'll answer and generally be positive but keep it short, so I just let it be. Problem she still keeps on staring and talks to my friends but again if I try talking to her or enter the conversation she just starts looking in every other direction and gets quiet?

What gives?
She keeps staring but won't talk to me, what gives?
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