Thanks for that last information. It helps a lot.
Nugget may be suffering from an infection in her reproductive track caused by the irritation of the egg breaking inside her. This is not a rare event with layers. It's very important to treat it with an antibiotic.
You probably don't have an antibiotic on hand unless you have some left over from someone in your household needing one for a recent infection. If you do have an antibiotic, please give us the information, and we'll let you know if you can use it.
If you don't have an antibiotic, go here and order the Fish Mox 250mg.
https://pet-healthcare.revivalanimal.com/search?p=Q&ts=custom&w=fish antibiotics
Meanwhile, give Nugget a calcium tablet if you have any on hand. If not, get some at
Walmart in the pharmacy. I like to use the calcium citrate mini-tabs with vitamin D3. Give her one whole tablet for two days in a row.
Watch to see if she is passing any more egg remnants. It's also possible she has another egg coming down and it's stuck behind egg leftovers from a week ago. The calcium will help her pass it. Keep her in a quiet place and warm. Also, be sure she's drinking lots of water. If she isn't you need to get some warm water into her asap.
The antibiotic is important to clear up the infection so she might be able to lay again in the future.