Did you figure out why she's feather plucking?? It's either internal stress, or external stress.
Internal could be diet or health, external = something in her environment......
I have found Missing Link to help greatly with feather pluckers. Ask your vet before adding it to the diet though.
Amazon.com: Missing Link Avian Formula (3.5 oz): Kitchen & Dining
I had a cockatoo here who was allergic to the dye in the pellets. Bad feather plucker. It took months to figure out what the issue was. It happened on accident. The fruit blend zupreem was not available, but they had the undyed zupreem....just plain in color is all.
Well almost right away I noticed a change in habits, screaming, eating, and feather plucking. Feathers grew back great. I had to change the diet. All the feathers grew back eventually