Couple of things:
(1) Stop giving your snake baths. It does a lot of harm and almost no good. Ditto with stuffing her in a pillowcase. You keep messing with her and the shed will be the least of your issues.
(2) Stop messing with the humidity.......there is no magic humidity number at which you will get a perfect shed. I've had balls shed perfectly at less than 40% ambient humidity.
(3) Provide humidity via a humid hide. You are courting all sort of health issues when you bump up the ambient humidity at the temps we keep ball pythons at. Your enclosure becomes a petri dish for all sorts of bacteria. Most set ups are not adequately ventilated to support high humidity and relatively warm temps safely.
(4) Stop messing with the snake, stop worrying about when and if it will shed and leave the animal alone. Make sure it's temps are good, and make sure you provide the humid hide. Don't give another thought to things like baths, shed timelines and how to crank up the ambient humidity. If the temps are good and she feels secure, she'll shed just fine.
(5) Don't make this harder than it needs to be. The animal knows what to do. What you need to do is to leave her alone so that she can do it without getting stressed out.
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