I am sorry that you lost her. You could do a home necropsy on her, opening her belly to get a look at her abdominal organs. That is what I do when I lose a hen. Taking pictures of the liver, intestines and other major organs and abdominal contents can show cancer, ascites or water belly—yellow fluid inside the abdomen, large amounts of fat from fatty liver disease, and other things. Post pictures here if you do one. It is understandable if you can’t do that, but we all learn a lot from a necropsy.