Yesterday evening, my pullet looked just fine, was flying about and eating and drinking. When I went out at eleven at night because I had forgotten to put their feeder in the coop, she looked at me from the roost. But in the morning she was lying on the ground, stiff and cold. My two hens and two pullet's were fine. Why did she suddenly die? I did catch her eating a leaf of a night shade plat the day before but would that be enough to kill her? My other two pullet's ate some as well and they are perfectly fine. She'd been laying perfect eggs everyday before, and she seemed perfectly healthy other than being slightly thin. What killed her, and will it kill my other birds?