[Chicken Pete]

Hi Call, for what it is worth I had a similar situ and the poor hen lost many feathers being
chased around,etc.  What I did was to erect a small run to the side of the main run so the chicken could see the others but had the safety of the wire protecting her.  She soon got her feathers back and gained in confidence, we I put her back with the other there was a little 'aggro' but it settled down.
Thought this might be an option..