Most state vets will perform a necropsy for a fee if you want to rule out a disease or find a cause of death. Many of us do home necropsies, which basically for me is just to open the abdomen and examine the organs. When I do that, I would take pictures of what they look like, especially the...
I would feel of her lower abdomen between her legs to see if it is larger than normal or looks like fluid in the belly. Did you insert a clean finger into her vent 2 inches to feel for a stuck egg? Have you ever seen any thin or shell-less eggs from your hens. Shell-less eggs can be hard to...