Help! We are new to chickens this year, have 5month old hens, no newbies, one of our red hens has been ill for a few days and we can't seem to figure it out. She first got clumsy/cold like symptoms, mucus/nasal congestion. Now she is getting worse, nasal congestion seems to have cleared some, but she is very lethargic and can barely sit on her own, she does try to eat/drink if given food. We have her seperated from the rest of the flock. No mites/lice. Been giving her electrolytes and extra protein. Also has diarrhea. Please help, we don't want to lose her.