LeslieDjoyce I really hope it is not yeast infection as I am starting to worry about it.
The redness has almost gone but the feathers are always sticky looking and wet. Diarrhea have started again
I put apple cider vinegar with a clove of garlic in their water now and sprinkled dry garlic on their feed.
She is sleeping with the other chickens today.
What did you use for the yeast infection?
Official recommendations for treatment if vent gleet type symptoms differ a LOT, from antibiotics for bacterial infections to recommending against antibiotics because antibiotics make fungal infections worse.
I had a hen with a prolapsed vent and dirty butt with stink. The hen was active and thogh she also has feather loss due to molting and over mating, I didn't spot anything to indicate parasites or sickness from bacterial infection. That night I brought her in for a bath in very warm Epsom Salts. I got as much of the gunk off as I could by soaking, rinsing and scrubbing with a soft toothbrush and a soft wash cloth. I also used a pair of tweasers to help peel off a few little bits ... but was super careful with the very tender vent prolapse. I gently explored/massaged her bottom a bit to help her pass any impacted poo and feel if she had an impacted egg, but didn't feel anything too suspicious. She did pass some poo pellets which could have been part of the problem, or not.
Using some water-based lubricant I explored inside her vent to make sure she didn't have anything in there. I found no egg shells. I also popped the prolapse back inside.
Then I treated her vent interior with preparation h to help shrink the swelling.
Then I applied some athletes foot cream to the area ... this is effective for fungal infections, which yeast infections are. But I gather not all "vent gleet" is fungal.
I repeated this for the next few nights until she looked and smelled better and stayed clean on her own. Then I put her back with her friends. I kept an eye on her after that.
Note: I am not a vet and did not seek the advice of a vet. I did a fair amount of Internet research, and chose what sounded to me to be a conservative approach based on the info I found doing the Internet searches and what my gut told me about the situation. But your situation might be very different than mine so this approach might not be good for your hen.