Woman body language rubbing earlobe?

Anonymous
Basically this girl in work, when me and only me goes into the office she's in too deliver post/ paperwork etc, she will twirl her ponytail, or touch her ear lobe or cover her mouth with hand. She never does it any other time, just when I go in, what does it mean? But if we talk she won't she will just talk normally, although sometimes look a little peed off... She very rarely acknowledges/ or speaks to me?

Is it a sign she could have a bit of a crush will all the body language etc
Woman body language rubbing earlobe?
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