[racinghamster]

Hiya. I would keep her away from sand if she`s reacted this way. It may have triggered a reaction while your other hamster is okay with it. Hamsters don`t have the same dense fur that chinchillas have and daily exposure to sand could dry the skin. So if she`s continuing to be irritated, it might be worthwhile having her fur/skin looked at by a vet, although if her environment hasn`t had anything new added that could cause mites or lice, chances are she will settle down and she`s just over grooming.

Rub her fur the wrong way along her back and check for any redness or flaking or missing patches of fur/scabs. If you see anything you feel is not right, then either the sand has caused a temporary reaction. x