I have a Bantam Cochin Hen...about 4 years old that had been acting normal until about 3 days ago. She starting acting like she was broody (laying on my other hen's eggs), so I didn't think anything of it. Two days ago, when I picked her up to get the eggs from under her, I noticed that she felt a little lighter than normal and her comb and waddles looked pale. When I filled the chicken feeders, she ran over and started eating like normal. I put a small food and water container in the layer coop so she had access to food and water while she was broody. Tonight, she was in the layer coop, but not sitting on the egg that one of my hens laid. When I picked her up out of the layer coop and set her on the ground, she almost fell over. I opened my feed container and put some in my hand. She tried to eat some, but seemed like it was hurting her throat or something. Once I added some water and made a mash, she ate more. I put her in the layer coop with a heat lamp, water, mash, and closed the layer coop to quarrantine her from my other hens). She has no sores, no oozing, her eyes are clear, she does seem weak, she has both legs on the ground (is standing), she has her feathers puffed out, she is not tucking her head under her wing, she wants to sleep, she had...that mosquito borne illness in the past...sorry the name is escaping me (this is one of my original hens and I hate to lose her). Any ideas what is going on?