Chipmunk Chicks
Free Ranging
You are so sweet to tag me! Haha I am not even remotely in league with these other friends here hahah@Wyorp Rock @nuthatched @Eggcessive @EggSighted4Life @Chipmunk Chicks do any of you folks have an idea what's going on with her chickens, please?

I agree that it sounds like you've tried just about everything I know I would have. I'm assuming you followed all the instructions, and you said you treated the whole coop and run. I would be keeping a close watch to try and see if there is not still a behavioral thing going on, with bullying or feather picking, and maybe continue the blu kote in case they are being drawn to the fed skin? I'm so sorry you're struggling with this right now. Don't give up! These things are exactly what serve to make us better chicken keepers going forward.
As for breaking the broody, Orpingtons are known for going broody, so it kind of depends how much you may need to do to snap her out of it. Dahlia Monterosa (sp?) is another great chicken resource on YouTube and podcast addict, her show, Welcome to Chickenlandia. Some of it is a little woo-woo, but most of it is solid.
