I had the same problem 2 days ago with one of my hens. I noticed her vent was prolapsed when I let them out that morning, she had blood and poo hanging out, not pretty at all. I found a broken egg in the coop, I was sure she wasn't going to make it. I removed her before the others noticed. I placed her in a small dog kennel on my back porch, after I cleaned her. I didn't do the warm bath, only a warm towel to clean her up. I sprayed hydrogen peroxide on her and pushed it back in the best I could. I was sure I would lose her, but to my surprise it worked! Her vent looked normal after a couple of hours and she laid an egg in the kennel. I placed her back with the rest of the flock at the end of the day. This was my first time dealing with this, and I did the best I could for her and it work....Thank God!!