Girls, Why is she suddenly nervous around me?

Anonymous
I've known her for sometime now and we get along very well. I've noticed that see seems to be a bit nervous around me now for no reason. Like the other day she was walking towards me and was looking sideways but twirling her hair at the same time, as I approached her. 5 min later she was talking to me. It's weird I feel sometimes she avoids eye contact with me. I did she her cheeks go red the other week when she approached me.
Girls, Why is she suddenly nervous around me?
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