Yes, No & Maybe.....
Because plucking can be a medical problem, a psychological problem or a habit, you will not know until she starts moulting again. Environment, diet, allergies, second hand smoke, neurotic behavior...all of these could be the or one of the causes. It can also be a addiction...some parrots even pluck and/or mutilate themselves because of the endorphin rush they get from the pain
It will not be an easy or quick process, unless by some miracle, the problem was her previous home & moving in with you cures the problem. You will need some type of log to eliminate things as you go...also, although some species of birds moult throughout the year & others change out their feathers once or twice a year, it will be a time consuming process. In order to eliminate a health connection, an exam & series of tests will be needed, so there will be that expense.....
Good luck