My chicken has just died; a few months ago she started laying white eggs instead of brown, then they were thin shelled and occasionally soft shelled. I put calcium in the water, but it didn't help. She then stopped laying altogether, but was still happy and healthy. Just before Christmas all her chest and leg feathers disappeared; there were no feathers laying around, so I don't know if she ate them herself. She came out of the coop when it wasn't too cold or wet, and I was giving her water with electrolytes, vitamin d, scrambled egg and cottage cheese. She also ate pellets. Then yesterday morning I found her near to death in her coop. She couldn't move or open her eyes, so my husband helped her on her way. She was only 9 months old. She was a copper black. My other chickens seem okay. Any idea what was wrong with her please?