I joined yesterday and have had two Plymouth Rocks for only about two weeks. They weren't even laying yet (about 18 weeks). Today I spent a lot of time with them and everything seemed okay. I went to my daughters piano lesson and when we came back 2 1/2 hours later, one was dead. There didn't seem to be any lacerations or blood anywhere. There were a few feathers, but not that many that would make me think she was attacked. How do I deal with this? They have a nice size coop with an enclosed run at night. I even have nite guard on all four sides. I'm worried the other hen is going to have the same fate and I don't even know what happened. Also, will my only hen be lonely? Should I try to find more chickens now? I've just started and already I feel like I've failed.