Glad to hear she's recovered! As long as all your temps and humidity are correct I believe this is normal and probably happens to all snakes, but is just more noticeable on pale-coloured ones. My BP is an albino mojave and I occasionally also see bits of his skin looking a tad pink like your photo above. It is from scraping or squeezing something when climbing or from sleeping in a position so that a rock hide presses down on their body in my experience, and usually disappears in an hour or two.