I had a young corn snake that shed on a similar schedule. I gave him a drop of a good bird liquid multiple vitamin in a dead mouse and he straightened out.

Its been proven in many species that breeding females need extra vitamins/minerals compared to nonbreeders. Insufficient vitamins in the mother can produce stillborn babies and congenital deformities.

IMO, that python is using stored vitamins to produce eggs and lacks enough to shed properly, too. I'd get extra vitamins in her ASAP. Good luck.