Last night a possum got into my coop and killed one of my hens, I had 4 birds and I noticed after the incident, one bird was out of the coop, I thought nothing of it and she went back in after I checked her for injury. This morning I went out to give them spinach and she seemed out of it, she didn't eat the spinach and kinda stayed away from the other 2 I was thinking maybe she's depressed or sick?