Black Australorp pulling out breast feathers

[KKarwowski]

Hi, everyone. I have 6 Black Australorp hens that are all laying well. However, one of them is pulling out her breast feathers on a regular basis. Sometimes the other girls will pick at the bald area but not always. We have been applying the Blu-Kote stuff and she seems to leave it alone for awhile, then goes back to pulling out the feathers in a week or so. None of the other hens are displaying this behavior, and all are healthy and I have been proactively treating them for mites in the coop and run. Does anyone have any suggestions? I do not believe she has any parasites.

 

[speckledhen]

Generally, the only time a hen does that is if she is broody. It allows for contact between her warm, moist skin and her eggs. Has she had any other odd behavior?