Oh boy... Plucking can become a horrible OCD habit with macaws, so you must find a way to nip this in the bud ASAP. FIRST-- Get her checked out physically. There are various medical conditions (skin infections, parasites, bad wing or nail clip, injury, internal issues) that can stress her enough to cause self-plucking. She may have nothing, but you must rule them out. Take her to a vet that specializes in birds (not all do). Might be called an "exotic" animal vet or hospital. SECOND --- The #1 cause of plucking is extreme boredom and loneliness. Macaws are so smart, they need as much interaction as small children. Here's a link with other causes and treatments & recommendations: http://www.usask.ca/wcvm/herdmed/applied-ethology/behaviourproblems/selfmutilbird.html Here's a small quote from it: "(1) The most basic option is to make changes to the bird's environment by increasing cage size, adding destructible and varied toys, making the bird a more central member of the family (that is, letting it outside of its cage for short periods throughout the day, spending time playing and talking with the bird and so forth), altering the routine or pattern of daily activity, and giving the bird a variety of inactivity foods or foods that require the bird to manipulate an spend time eating them (for example, a cob of corn, nuts in the shell, carrot sticks etc, foods differing in color, texture and taste)." -- There are other treatment tips/info in the link. Also, google "self-plucking macaw" to get more links for vets and other owners with tips to keep macaws entertained and interactive enough to curtail plucking. The "homemade destructible macaw toys" links (search for that phrase) can help too. Most of all, just make sure she gets more daily attention and play with her bonded humans.