What does it mean when a girl looks at you scared, looks at you down, and turns away if you look at her?

LinkxPeach

A girl on the train was sitting next to me. She looks at me, then looks down, and turn away when I look at her. Then, when I looked away. She looks at me, looks down, and turns away when I look at her again.

What does it mean when a girl looks at you scared, looks at you down, and turns away if you look at her?
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