My favorite hen Lucy died last nite. Since this past weekend she has been acting funny and would not eat or drink. She just sat on the floor with her head smushed into her body like she was cold. I called around to several vets and no one would help. Yesterday I put her into the bathroom and sadly last nite she passed away. But im at a total loss as to what killed her. The other hens are healthy and happy. I feed them good quality feed, keep everyone clean. One thing that is very strange, Lucy's comb turned almost black yesterday. Then this morning when I got up it was completely black. Any ideas would be helpful, this is the first bird ive lost and im quite upset about it.