Part of the problem was that you fed her during shed: digestion requires extra hydration from a snake's body, and so does shedding (snakes secrete a bit of moisture
between the old & new skin prior to the old skin sloughing off), so for a snake with inadequate humidity, the meal complicated her shed. Many snakes (especially those
well-hydrated & with proper humidity) can "multi-task" pretty well, but when they don't have optimum humidity, that's where you get in trouble like this, for future ref.
If she was my snake, I'd give her another soak, then some time enclosed with a very damp towel or very damp moss for a while, & thereafter give her a humid
hide that she can access at will. But right now, it's mandatory...you need to help her "undress" 'cause it just doesn't get any easier when it's crinkled like this.
Better to wait for snakes to complete shedding than to feed because they look hungry, because IF they need help, the handling (shedding help) can cause a
regurgitation of their meal...so be especially gentle with any assistance. It just would have been better not to have to worry about a regurge, but it's done now.