It looks like scaly leg mites, but it seems more yellow. What is the bedding and soil like where she spends her time? What are you using to soak the feet? Epsom salts is good. Will any of the material brush off with a toothbrush after soaking? I would use an oil, such as mineral, castor, vaseline or Vicks to coat the legs and rub into to smother any leg mites. Nustock cream has sulfur and it will kill the mites as well. Do that every other day, then twice a week for a few weeks until the new scales grow in. I am tagging
@Wyorp Rock to have a look at the pictures here, to make sure that she thinks this is scaly leg mites.