Have you tried supplementing her calcium for the egg issues? I would give her a calcium citrate +D (citracal or generic equivalent) 600-800 mg once a day for a few days, see if it helps her pass anything. Having said that, if she's not moving anything through the crop, it's not going to help as much. If you can get things moving, try that to see if it helps egg shell quality. But she may have a shell gland disfunction.
What did you worm her with in July, and dose?
Does it feel like grass in her crop? From her behavior it doesn't sound like antibiotics are needed just yet, and that could cause more issues in the crop if it's not moving. Antibiotics can set them up for yeast overgrowth in stuff sitting there. Description of the poop sounds like she's not passing food from the crop. When the stool softeners got things moving, did the crop empty then?
The issue with an epsom salt flush is dehydration. If she's already having issues, then you don't want to dehydrate her, so you need to make sure she takes in enough fluids if you try that.
Both the egg issues and the worm history could be causes or contributors, both of those things can cause crop issues.
These are very good articles and lots of info, may help:
https://www.backyardchickens.com/ar...ntion-and-treatments-of-crop-disorders.67194/
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/