I had this problem with one of my girls a few months ago but now it is better and the other hens have accepted her back into the flock. My hen was attacked by a raccoon and her eye was hurt. The other hens wouldn't stop picking at her. When I realized she was being bullied I brought her inside and treated her wound and she stayed inside for about two days. After the two days I brought her back out and the other chickens immediately attacked her so I picked her up and brought her right back inside. I tried again the next day but this time I had a water squirter. I only left her outside with the other hens if I was watching them, and whenever a hen pecked her I sprayed her with the spray bottle. For the next few days I went outside with her and the spray bottle and let her stay outside for about 20 minutes at a time under my supervision. After a few days of going outside she started to stand up for herself when she was bullied and the chickens began to learn not to peck her or they would be sprayed. After a day or two more of this the hens stopped pecking her altogether and I let her spend the night in the coop. The next morning she seemed fine and the other chickens were not pecking her so I left her out there permanently. Today she is still at the bottom of the pecking order but is rarely bullied. I highly recommend using a squirt bottle, it worked very well for me.
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