That's not true! Chickens do feel pain why do you think so many chickens do not fully recover from this surgery? It's very painful and sometimes they never recover from the shock and trauma. Anything with a nervous system feels pain. I wouldn't want someone cutting me open without a local...
Molting is hard on chickens. My one hen just recently went through a hard molt. She was staggering couldn't walk straight. I knew it was from the molt because she was fine otherwise. She was off balance because she lost so many feathers. She had no feathers on her wings whatsoever. She's fine...
My hens will periodically do that also. I think that sometimes they eat a feather or who knows what. Mine will do it for awhile, then it goes away. If there is no other symptoms it may be just that. Keep a close eye out just in case.
Sometimes they'll do that to adjust the food in their crop. Feel her crop tomorrow morning before she eats. That's when it should be empty. If it feels full then she probably has a impacted or sour crop.
When hens are young and start laying, this sometimes happens. Sounds like you've been doing the right things, the rest is up to her. Hopefully when the swelling goes down, the vent will go back in. That prolapse looks the same as one of my young hens had. It was a bad one. Hopefully your hen...
Put a crate inside the 3x3 enclosure. Keep her in the crate for a couple of days so the leg can rest. Then let her out for only 10-15 min. 2-3 times daily to hobble around. This happened to my hen. She sprained or pulled a muscle real bad in her leg. It took her 3 months to get back to normal...
Use firm pressure between thumb and index/middle fingers pinching and massaging. Don't move it up, you want to massage it back and down towards the hole in the crop. My hen only had grain in her crop because I could feel it in there. If your chicken has hay/straw or grass balled up in there it...