Feather picking - painless peepers

[henny_penny101]

Looking for advice....I have five chickens almost a year old. 2 golden wyandottes, 1 silver laved wyanndote, and 2 bard rocks. 4 of the five chickens have bare bottoms. I posted pics previously and the group thinks I have a bully which makes sense. Although I've never caught her. I'm guessing it happens at roost time. Anyway, I isolated the bully for three days in the coop. She seemed fine with it and I thought it would reduce her pecking order. She's been in with the flock and things have not gotten better based on wider bare bums of the chickens. So I now have put on the pin less peepers. She seems fine with them. How long do I keep them on? I'm frustrated as I've never caught her bullying but she is the only one with all her feathers. Trying to figure this out....

 

[sourland]

I would leave them on until the rest of the flock has regrown their feathers.