So, I have a barred rock hen who is very sick right now. She is around 2 years old, and has had ongoing pasty butt situation for at least six months, and no matter how we have cared for her (cleaning it thoroughly, acv in the water) it always comes back. So yesterday I noticed this same hen was acting funny, last out of the coop (usually she is first) and just standing still and uninterested in the scraps I threw the flock. Today I can see that both eyes are swollen shut. So I can tell she is very sick, and it is chilly out and I want her to conserve her energy as much as possible, so I separated her from the flock in a giant cardboard box in our utility room. She is on some layers of newspaper and pine shavings. I gave her sugar water with a dropper onto her beak, which she drank readily and perked up a lot, and a little jar lid of plain yogurt, which she ate a bit of. She appears just sickly and mostly blinded by some truly gross looking eye infection, and her pasty butt is bad as ever. The rest of the flock is, and has always been, healthy. I'm about to go clean out the whole coop and put fresh bedding for the rest of the flock, in hopes they won't catch whatever might be infectious. My husband is planning to wash the pasty butt situation this evening (which we have done in the past), unless it seems like it would stress her too much. I don't even know if that is related to the eye problem. Anyway...what would you do next?