Do you want to find out what was wrong with her when you lose her? Most state vet labs with perform a necropsy and can diagnose what was wrong. The body must be kept cold, not frozen and taken in or shipped overnight. Many people also do home necropsies, and it can be a good learning experience. If you do one, taking pictures of the organs may help us help you know what was wrong. I found cancer in one of my hens once. There are a handful of different cancers common in chickens, and in ovarian cancer, it can have a cauliflower appearance as this one:
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