If a girl is twirling her hair is that a sign she likes you?

I was talking to a girl that sits behind/next to me in class and we were talking the entire class and she was laughing at just about everything I said and she made some jokes too and for a little she was playing with her hair. Are these a good sign she would say yes if I asked her out.
If a girl is twirling her hair is that a sign she likes you?
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