Thanks for the advice. I'll keep up the training. It's so frustrating. I put her back in and she was instantly back at the pecking feathers business. She got to where she knew she was gonna get poked, so she would pick and run like the wind. Then a couple of them were chest bumping. Makes me wonder if some of my "pullets" are really cockerels.
Finally got them settled down & put them to bed for the night. She seemed ok this morning, so I left her in with them when I went to work. Came home to check on the a couple hours later & found that she had pecked one until there was blood, and the other two until they had new bald spots

Then I noticed the others picking at each others spots again. I covered them again with Pick no More and put them back in. Then the offender began pecking at the black Australorps whom she has never bothered before. (She only picked on the other Buff Orpingtons) Took out the offender and put her in solitary again until I can be there with them this evening.