I was just outside with my 9 chickens, and one of my 2 year old Red Sexlink hens looked ill so i sat down with her on my lap. Her nostrils looked very dark, and her comb very droopy and purple. She was extremely light, and it was obvious she wasnt healthy. She just vomited on my lap and it was a dark brown, smooth liquid. Can anyone help? Should I isolate her? Thank you, Jenny If it helps: None of the other chickens seem sick, but she is very light.... none of her feathers seem to be damaged.