We were on a 3 week vacation and had someone come in once a day to feed, collect eggs and clean the coop. Our 4 hens (2 Americanas, 1 Rhode Island Red and 1 Buff Orpington) were very healthy when we left but were used to a lot more attention as we ordinarily spend a lot of time outside with them. When we returned last Monday, 8/22/11, one of the Americanas was dead in the coop, with no sign of an attack or illness. Since then, the Buff Orpington (Buffy), who used to be a reliable layer hasn't laid a single egg and her personality is completely changed. She's listless, doesn't run to meet us when we come out, has very little appetite, seems smaller and her comb is not as bright a pink or standing up like it did. She makes little crying sounds which I haven't heard before. Her eyes are clear, she's breathing normally, there are no lumps in her chest although her breast bone is quite prominent and she isn't egg bound. Hope someone can help!