One of my greys started plucking a few years ago, ( her chest) I realize its a stress thing regarding my long time amazon who is a hog for attention. I try to give her more special time with me, it has helped. DO NOT try & help with pin feathers..they are quite painful when coming in & you should avoid that area until they have come in naturally. I find pin feathers on my amazon when she is getting head scrunches, but I just go very very light in that area.. Mist them with a mixture of warm water & aloe juice, that soothes the skin. I also wrap up safe pieces of broken wooden toys & put them in a toy bucket for them to forage thru & chew the paper to get to the inside toy. Folded up paper, junk mail
( envelopes that haven't been opened). Popcorn as a snack will keep them busy, my grey LOVES uncooked egg noodles, they keep her busy for quite some time crunching & eating them, put the tv or music on if she seems bored. Try a bowl of water for her to splash in, corn on the cob to chew on, my grey prefers small cockatiel size toys, not parrot size ones..just suggestions for occupying her in hopes of distracting them. They do tend to pluck when their bored if it has become a habit. Best of luck & keep us posted.