Girls, Eye contact from a girl, what does it usually mean?

Anonymous
there's a girl who will look into my eyes and hold contact for about 3 sec. We dont talkmuch but I also notice that she plays with the her hair when I look back at her. But a times she might stand with her back towards me talking to her friends and ignores me when we are in the same room?
Girls, Eye contact from a girl, what does it usually mean?
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