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Insecticide poisoning, internal laying, botulism toxin from digging up infected insects, congenital heart defects, etc.

The only way to know what killed your hen is a necropsy. You could cut the hen open yourself and examine the body cavity for anything unusual. Often the cause of death will be staring you right in the face. A stuck egg. An enlarged liver, tumors, etc. If she had gapeworm, you would see them...