I have a 5 year old white leghorn that has been acting lethargic, has lost weight and has not been laying in about a week. Her comb is shrunk down and kind of deep red/purplish and her face has lost all of it's red color. I have her in a dog crate but in the coop because I have new chicks in the house. I have added crushed garlic in her water and have given her canned cat food mixed with yogurt. she has eaten a little of that also I gave a couple drops of nutria-drench. I also checked her vent, nothing going on there. didn't see any mites or lice. Is there anything more I can do?