Give her, her favorite meal n let her stuff herself, let her eat as much as she wants. I find when any of my snakes take forever to shed, and their skin looks like this they just need a big meal. Its like the extra girth stretches the skin n gives them just that extra nutrition to get the skin off.

Works every time for one of my flames, she'll go blue, then clear, then just stay dark n kinda loose skin like that till I give her a big meal. That is exactly what this looks like to me. Just need an extra boost of food. I can imagine new skin growth n the whole shedding process takes a lot of energy.