What does it mean when a girl is twirling her hair as she is talking to a guy?

This girl was sitting next to me at lunch and she started conversation with me. She and I started talking and she was twirling her pony tail as I was talking but she was looking at me. I do like her and I noticed she is a little quiet with me but has dropped a few subtle teases towards me. Plus she is offering to help me with tasks too.

What does it mean when a girl is twirling her hair as she is talking to a guy?
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