Some people will believe anything you tell them if you say it with sober authority.
I'd like to address pinless peepers. First of all, if your picker has been wearing them for many months, try removing them. She may be fine without them, and it would do her good to be without the encumbrance for a respite.
Little Cluckies is a hard case like Flo (used to be). Flo managed to adjust, as did three of my other hard cases, to the peepers and pick feathers as if they weren't wearing them at all. That's when I tried the bumpa-bits, but they learned to pick feathers with those devices, too. Bumpa-bits fasten in the beak holes, but fit in between the upper and lower beak to prevent full closure.
When I have a serial picker(s) that persist even with beak implements, I then separate them from the main flock out of sheer preservation of the victims. This is the point at which other people cull or re-home.
I've also gone the route of protecting the victims with saddle aprons that I've designed and sewn to cover the target areas. However, many chickens outright refuse to wear them. Joycie, Flo's main victim, would remove her cover every single time. The one my neighbor crocheted for her, she would unravel with her beak. One time I found her quite tangled up in yarn she had dismantled. Apart from it being funny, it was also alarming due to the fact she could have strangled.
Throughout this thread I've warned there is no lasting solution to feather picking. If you find it impossible to cull, all you can do is keep rotating the different approaches, and hope that at some point, the picker will decide to hang up their career and retire as Flo appears to have done.