I don't think that's scale rot, I think it's just more bad/flakey shed. Unfortunately you can't fix months of bad husbandry and dehydration with a few days of correct husbandry. The good news is that it doesn't look like your snake has an RI based on your observations.
You said she's eating regularly. If she takes f/t then offer the feeders wet, it will help to rehydrate her. I think this shed will just be awful and you'll have to continue helping her with it. Her next one will be a lot better as long as she stays hydrated.