I hope this worked. It is difficult to see, but the area above the vent, but not the vent itself is torn. The muscle is sticking out.
If the other chickens did this, then I could imagine that the wall of the cloaca was abused also. I will try to get the muscle to shrink up a bit with the wonder dust, and then clean it off enough to try and glue her back together.
She is in dark box next to the wood stove. She was shaking after we washed her off.
If she starts to look like a lost cause, my husband already said he'd do the deed. Bummer.