I found one of my young pullets (about 10 weeks old) sitting by herself. She did not move when I approached her and is weak. She let me pick her up without a noise. I isolated her and put feed and water out for her. She has been eating regular chick grower and drinking plain water. She is not interested in food or water. I looked around the run and saw no bloody or unusual poop. The others seem to be o.k. I just checked her and there is a little poop on her back feathers and I saw a poop that looked like spilled milk. Not sure what to treat with as I have had chickens over a year and this is the first sick one I have had. I looked at a site with poop pictures and saw none that looked like hers. She is just weak and is holding her head up but not moving. Thanks for any help.