With grim disappointment, I must report that Flo has relapsed back into her frenzied, compulsive feather-picking ways.
It's been building up for the past several days so I put her in chicken jail this afternoon after the flock had spent a few hours free-ranging. I returned later to check on Flo, and there she was, wandering freely with the others in the main part of the pen. She had figured out how to escape. I returned her to the "jail" enclosure and sat down to watch how she did it. She jumped up onto the perch, and flexed her knees several times, then made a giant leap over the fence.
While I was fixing the fence to make it escape-proof, I saw Flo racing around from one hen to the next, relieving them of feathers. I haven't seen Flo in such a feather-picking frenzy since before I tried Forco on the flock for the first time. She was like a tractor mower, shaving feathers from one end of the pen to the other.
This is after I trimmed her beak back to the quick, and hand-feeding her Forco ration to her each day to make sure she got her share.
I have no clue what has caused this current relapse. Perhaps it's the stress from starting to lay again after fall molt. But she's been laying for about two weeks now. She's definitely more hyper than usual. I'm hoping this is temporary, like her other relapses, and Flo will calm down again and lose her sudden interest in eating feathers.