She can't look me in the eye? What does this mean?

This girl I like was telling me a story and we were standing probably one foot facing each other. As she was telling me the story she would look at me for a split second and look down and away, and then turn her head to look at me for another split second and down/away again.

She is seems comfortable touching and being in my personal space.

Does this mean she is nervous or something else? She is generally not a shy/nervous person.

She can't look me in the eye? What does this mean?
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