A month and a half ago, I noticed a chicken (1 year old) looking pretty sick. She had been showing signs of illness, pale comb layed over, a little bit of a pasty butt, becoming less active. This day she was hunched over, her bottom feathers revealed diarrhea, and when I picked her up, she felt so skinny and I then realized how weak she was. For 2 weeks, I gave her Epsom Salt soaks, which seemed to give her a boost, and gave her anything I could get down her. I put edible DE in it and tried coccidiosis medicine just in case. One day she would eat raisins, the next she wouldn't touch them so I tried something else. One day she would eat it, not again. She started pecking around the yard again and seemed to regain some strength so I let her join the chickens in the coop again and then she went back down hill and I couldn't save her. I now have another chicken showing the signs. She isn't as bad yet, but I don't know what to do to save her. Any ideas what is going on?