Feed her on a 5 day basis a meal that is about 10-15 % of her body weight. I would say 10% of her weight seeing as she is way underweight for her first couple meals. Keep doing what you are doing for the humidity but the stuck shed will most likely come off during her next shed.... You could give this a read and double check all of your husbandry too!
http://ball-pythons.net/forums/showt...thon-CARESHEET