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It sounds more like she is trying to scent the bedding up as it smells different to her usual. The way she is acting sounds like scenting. The groom to get the scent spread from their hip glands on to paws and on the fur surface then they rub and roll to spread it. Don't overclean for now and let her get her scent around her. Spot clean the wet corner only. Mites usually show as red skin and pinprick scabs so don't treat unless it is shown that she has mites. If very worried I'd see a vet.