Why does she touch herself when talking to me?

I've noticed when I talk to my friend she won't look at me in the eye when she talks, she'll look in the other direction or at an object but I get occasional glances at me then back at the object or other direction she doesn't maintain eye contact. I also noticed when I looked at her and she was talking while looking the other way she would start scratching her neck or brush her hair to the side with her finger. No one else was around us. Why does she do this?
Why does she touch herself when talking to me?
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