The last 2 days she hasn't been running around when I go out there like the others. She would just lay under the coop. She did come out for a little while yesterday to drink and eat. Then this morning we found her dead. I have 6 hens and they are all healthy, large birds. 4 are Rhode Island reds and 2 New Hampshire yellows. She was a yellow. They were this years Easter chickens. 4 are laying but she isn't one that lays. What could've possibly happened, I'm so shocked.