Girls, what does rubbing a guys back while hugging mean?

Anonymous
There's a girl I like at work, and recently when we see each other in the break room, we give each other hugs when we greet each other. Over the last few weeks, I began to like her and I think im crushing big time on her.

So when we hug, I grab her around the stomach area on the lower of her back, and she wraps her arms around my neck, keep if mind she is pretty short. Then all of a sudden, she always starts scratching my back for like 5-10 second. Our hugs are usually 10 second long or so too if that matters. Do you think she likes me too? What do you think it means that she gives a nice back scratch during the hug?
Girls, what does rubbing a guys back while hugging mean?
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