Polish chicken getting picked on.

[Jsnick]

Hi, I have a 6-month-old Polish who is so sweet. I also have 2 Wyandotte's same age. One Wyandotte is laying, and the other is very close. Since the weather here in Illionois has changed and its colder. It seems one of the hens' pecks at the Polish's head or her back. They have plenty of room, boredom feeders, roosts and dust bathing area. I also let them free range before it gets dark for more exercise. I'm planning on getting another Polish in the spring.
How do I get them to leave her alone? Any ideas would really help.
Thanks!!

 

[sourland]

It's a sad reality that Polish in mixed flocks frequently have their crests targeted/plucked. It may be necessary to separate her from the others if they start drawing blood. This can lead to scalping.

 

[Jsnick]

Thank you, I hope I wont have to seperate her. They never have pecked at her crest before. I might try to trim her crest and see if it helps.