I didn't find much though I've never opened up a hen before. We've butchered plenty of roosters. Her abdomen was filled with clear water. Heart looked normal. Liver seemed large and so did the gallbladder. The ceca were both full and kinda greenish. I'd never even noticed the ceca in any butchered roosters but they were very obvious in her. Is that normal? Other than that, I didn't see anything else. Her crop was normal besides being almost empty, no sour smell.
It's sounds like this ---> http://www.backyardchickens.com/t/68731/laying-hens-with-water-belly-or-ascites