Nervous behaviour in shy girls?

If a shy girl can barely make eye contact with you and when she talks to you and when says 'Hello' she only looks at you in the corner of her eye is it safe to say she is nervous.

She seems to be fine talking with her friends even though she is on the shy side. It is only me that I have noticed her being nervous around of people she knows. If she doesn't know someone she'll be shy too.
Nervous behaviour in shy girls?
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