This sounds like a habit which is one of the so-called 'self-soothing' habits. If the teacher has not remarked on it don't be too concerned yet. Try'your best to ignore these hand movements of hers, easier said than done, but it helps not to draw attention to a habit like this. Give her time and if she is still doing this in 3 month's time it would be best to take her to see a child psychologist for advice.
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