My silver wyandotte hen Roberta is sick. She has been squaking a loud odd call for the past week or so but otherwise seemed ok. Three days ago I looked her over real good and noticed a yellowy discharge from her nasal holes and one eye was a bit crusty. She also felt thin. I brought her in the garage in a dog crate, gave ACV water, wiped her nose with warm water Vet RX. Offered yogurt and applesauce. She is not eating or drinking. She is squatting in the crate and her head starts to slowly droop like she is falling asleep, then jerks up to take a breath. Her crop is flat and empty. I squeeze it to see if anything comes out with her head down and nothing. Only a bit of gargling. Now this morning my golden laced wyandotte was making the same weird squaking when I let them out this morning. I immediately brought her in and put her in a separate cage. She is perky and has plenty of body weight but her crop is flat and empty. No discharge. Followed the same procedure with her. Roberta seems to be on her last leg and is barely hanging on. I think I caught Gladys before she got as bad. What is going on?! I take good care of my flock of 16 and have never had any problems. My newest additions were back in April. Everyone seemed healthy. Help, please, before anyone else gets sick!