Girls, What does it mean, when she smiles a second then stop when she sees you & when I talk to her she avoids eye contact with serious face & voice?

Charles1718

I see her checking me out few times also once she was biting her lips and glancing. she is not rude in anyway, but I get an impression she is uninterested when I talk to her (serious face and voice) and yet again, I see her looking at me when I walk away or passing by and when I caught her looking at me, she smiles a second then stop, with a very serious face...

Girls, What does it mean, when she smiles a second then stop when she sees you & when I talk to her she avoids eye contact with serious face & voice?
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