Didn't she drink anything when you gave her the bath?
This was brought up on another forum, so I had to check it out and I have noticed that some snakes have some kind of trouble very often, and other going perfect even if they both are kept in the same way. I can even raise the humidity on the snake I know use to have bad sheds and it still won't help unless the snake itself drink enough water. Have to give them a bath before everything goes off. I even tested not to do anything with the humidity on snakes I knew did drink well, and all of them shed perfect.. Meals and water is a must to have hydrated animals.