Why is she fiddling with the collar of her shirt everytime I talk to her?

I've noticed she fiddles with the collar of her shirt everytime I talk to her. She is also playing with her name badge everytime I talk to her. It is confirmed she only does this with me. As my friend was talking to her and she doesn't do it
Why is she fiddling with the collar of her shirt everytime I talk to her?
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