Sorry to hear 😢. Hope you ended her suffering, a chopping block ends her instantly as you separated the whole nerve system, there is no pain.
This is heartbreaking but you really learn alot everytime something happens with chickens.
From the pictures she looked too far gone, best to treat stuff...
Hemorrhoid cream really helped in reducing swelling, pain, discomfort i am sure too.
My vet was not very knowledgeable about chickens until I start coming along, they should accept them if they accept other small animals/farm animals, mine has anyways.
After cleaning her up, bathing etc., The...
i had one that had a prolapse 3 years ago (black also as other chickens were pecking at her). Preparation H (hemorrhoid oitment) helped temporarily until brought to the vet, push it back in and apply ointment... the final solution was to get her to vet, couple stitches in the butt, and prep. H...