The vent area looks as if she was pecked by the other chickens. Can you see wounds or pecks? I would apply some plain antibiotic ointment, and separate her into a pen or dog crate with food and water. A daily soak in warm Epsom salts might be helpful, followed by the antbiotic ointment. Vent pecking can be a result of overcrowding, too little protein in the diet, too much light in the coop, boredom from not getting outside, and others.Wondering if you could help me? This is as good of photo I could get of Theresa. The photo is more red than it actually is. She is eating, drinking and acting normal. Is this vent gleet? I’ve bathed and treated as such.