I've never used any mite treatment except PAM, and I've never put mineral on any of my snakes, so I'm really just guessing here. But, I think it is likely her skin will be messed up until she sheds again, but I doubt you harmed the layer underneath. If you keep the humidity up so she has a good shed when the time comes, she'll probably be just fine. I've heard soaking too much can actually dry the skin out by removing the oils they naturally have in their skin.