That's dimpling caused by dehydration. Make sure she's got fresh water in her bowl and maybe drop in a humid hide for her. How are you measuring humidity? Those little dial ones are horrible. It's easy to forget that with the heaters running more during the cold weather the humidity will get sucked right out of the air.
I would suggest covering a screen cover for a glass tank with aluminum foil before placing a wet towel over it. For one - eww...who wants a wet towel over their stuff? For two - where do bacteria like to hang out? Warm, damp places. Like that towel. Aluminum foil over 2/3 of the screen works just as well imo. Bonus humidity for having your water bowl under it on the warm side.
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