I have a sick hen. She is gurgling when she breathes and lethargic droopy tail feathers. No other hens sick in flock. I separated her and she laid an egg this morning still. No discharge from eyes or nostrils. No worms in poop. She doesn’t cough or sneeze. Any suggestions? Local vets don’t treat chickens so I don’t know what to do. All the google info just has me confused. I looked in her mouth I don’t see what online shows for a gap worm and she’s not stretching her neck out. I noticed about a month ago that she would growl or I thought it was growling. It wasn’t all the time but when she would follow me around and get happy she would make this growling noise like a dinosaur now I’m thinking it was more a sick sound and I missed it.