I have a Rhode Island Red hen about 2.5 yrs old that has been sick for about 5 days. Her comb is limp, she is very weak, and most noticeably, she is holding her tail very low. She eats and drinks water. I have given her some english peas and whole kernel corn from a can thinking it may help in some way. She stayed in the coup the last two days but is out today. I saw her poop yesterday and it looked kind-of milky with some normal looking runny poop also. Looked like an oyster. I have six other hens and one rooster and they are fine. I hope someone has an idea 'cause I don't. Thanks!