Okay, we’ll that is not ascites, but may be a sign of a cystic right oviduct. Chickens are born with a right and left oviduct. The right one ceases to function and shrivels up, while the left one produces eggs. If that right oviduct persists, it can become full of fluid and cause swelling in the...
It would probably be less likely that she has salpingitis if she is laying normal eggs most days. But water belly (ascites) can happen with reproductive disorders, fatty liver disease, cancer, and from heart failure. Most times we don’t know the cause of ascites until after death. It can be hard...
Sorry about your hen. She does have an enlarged lower belly I think. But she could be fat or have salpingitis (internal laying.) What do her poops look like? Are her urates on the yellow side or white? You can try to drain her belly to see if you get any fluid, and see if it is yellow or darker...