When a gravid/pregnant snake retains a shed in the later stages of pregnancy it can cause damage to the babies and mother. Her skin is already stretched to the max with all those babies inside and the old skin is like an ace bandage constantly putting pressure on the snake and babies it's like wearing a sock when your ankle is swelling. It's good that you got the old skin off, but now does she have feeling in the bottom half at all. Sounds like she may have a slug / jelly bean lodge and is impacted. You need to continue at this point soaking her in water and maybe she will work it out. I hope she will be just fine, but like stefan said you might need to see a vet.