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Ah, it's heartbreaking to see a bird plucking.. Even if it's just a habit, it's not a healthy one. :/ I'm guessing that this is your first parrot?

If you can, find out any history of the bird and when it started plucking, what it's diet was like, what the home that it stayed in was like, did it have toys, has it ever been moved, etc.. Basically, take note of everything (again, if you are able). Also, did you take her to an avian vet, or a general vet?

We've got a CAG that started plucking in November 2013 after our roommate (his owner at the time) returned from a two month long trip. It didn't stop for over a year and it has taken a substantial amount of time and effort on our part to make him feel happy and secure. Yet, that didn't help. He would be happily preening on one leg, fluffed up, and pull out neck feathers while he was on our shoulders, knees, etc. (I call it his "survivor's guilt" for enjoying new owners). He was very comfortable, and very content. It made no sense. Here's some solutions that worked for us, or have been recommended (in case you have more luck with them than we did). Also, bear in mind that habitual plucking doesn't always mean that the bird is unhappy (even if she is at the moment). It's a bit like a person biting their nails. It starts out for some reason or another, but then it turns into a habit and they do it because they do.

What we've tried and has been working (He's been on the supplements for 4 months and it didn't look like they were doing much for the first two): A healthy diet of minimal seed, pellets, and fresh veggies twice a day - one scoop of featheriffic! in the mornings, and one scoop of Avicalm with each meal (breakfast/dinner). These supplements have worked for us, but our vet had warned us that they'll mask any underlying problems if they should work. Just something to keep in mind.

Another thing suggested, which might not be a good solution for you as you just got the bird and it might not like being sprayed: Featherglo. The bird store where our CAG originated from rehomes a lot of birds and recommended it as something that has worked on a few of their pluckers. I hate the smell of it and this only got attempted once.. :/

Some general things to do:

• Keep some toys in the cage to ensure that she has other things to keep her occupied and plucking isn't all that she has. Toys like this preening ring provide a bird with a good way to over preen something without destroying their own feathers..
  
• Clean the cage at least once a week and change the lining at least twice - it's gross and time consuming, but you never know.. Maybe a dirty cage could be one of the causes of the plucking..?
  
• Give her lots of love and attention - try not to focus on the plucking. Really, if it's seen as a way to get your attention and the bird wants your attention you could just be making the problem worse. It sucks, but it is what it is.. If it gives you any hope (and I hope it does!) our CAG didn't even want to be held by us when we got him. He would bite, etc. and was plucking.. It was about as frustrating as can be. However, he has warmed up to both my GF and I (more my GF) and we've got an awesome relationship now. Don't lose hope! Just be patient - 10 years is a long time to live with someone and then be given up.
  
• Make sure that her diet is as healthy as you're able to provide (lots of resources online for this, but you can always ask around here, too)
  
• Accept that she might pluck forever and love her anyways.
  
  Sorry that this is long.. :/