Try soaking her in a tupperware container for about 30 minutes to an hour. It works better if you put a lot of paper towels in the water so the snake has something to slither through to help pull its shed skin off.

It looks like your snake has plenty to rub against so i don't think that's the problem. What kind of substrate are you keeping her on? I have found that sometimes, even if the ambient humidity is fine, if the substrate itself is too dry then it tends to dry the snake out as well.