Unfortunately with birds they often don't show any symptoms of being ill until they are very seriously ill. It probably would be difficult to say what causes your hen to die without an autopsy, and even that might not give you an answer.
Birds that seem weak or lethargic are usually best separated, and placed some place where it is warmer and they don't have to search for food or water. For most of us, good nursing is about all we can offer in the way of treating are birds. Sometimes it works, but if something is seriously wrong you will probably lose them anyway.
Birds that seem weak or lethargic are usually best separated, and placed some place where it is warmer and they don't have to search for food or water. For most of us, good nursing is about all we can offer in the way of treating are birds. Sometimes it works, but if something is seriously wrong you will probably lose them anyway.