Please don't tell me a pet store told you that? This is ridiculous. Remove the sand immediately and get her on some kind of shredded wood (aspen, cypress, coconut.) Stay away from pine as some believe it causes respiratory problems. Sand will get under scales, in the nose / heat pits. Sometimes ball pythons miss when they strike prey and she could get a mouthful of non digestible sand. This was very bad advice they gave to you

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