I have a chicken that has been pecking away the flesh on her tail end. I took her in a few months ago, along with another chicken she was living with, that would constantly peck at her. She was in poor condition at the time. I kept her seperate for a while but when I put her out with my other chickens, her friend, began pecking her again, making her bleed, and now she’s started it herself. I have her seperate again. I’ve been trying to keep the area clean by tipping warm salty water over it. She is otherwise happy and energetic, eating quite fine and all. How can I stop this behaviour and what’s the best way to treat the damage she’s causing?