I am new to chicken keeping. We bought 7 hens near the end of January. We were told they were approx. 2 years old. Do not know any history on them. All were very thin. All but one is starting to gain some weight. One comet has been sick for a couple of weeks now. At first I noticed she just stood around with tail down and kind of hunched up. Saw a picture of what a sick chicken looked like, and that was her. After much reading and research I did an exam. Vent, crop, nose, eyes clear, nothing in her mouth. Can find no injury. I wormed her. Her poop has been yellow. She was eating small amounts. She has stopped eating as of 3 days ago. Up until yesterday she was drinking water. I noticed that she makes sounds sort of like gurgling and her crop was very squishy, like liquid filled. After reading and following instructions I made her vomit. Making sure that I did not hold her head down for more than 2 seconds. Only liquid was expelled and no smell to it. Yesterday and today I syringe fed her about 1 cc of water with probiotics and electrolytes. She either just stands hunkered down with tail down and eyes closed or lays with eyes closed. At times she moves head as if trying to dislodge something but I can not feel anything stuck. She is just wasting away. Is there anything I can do that I have not tried? Any suggestions will be greatly appreciated.