I saw some responses to a question like yours on another board.
Some of the questions asked were are you leaving the bird in a artificially lit room? Like in the garage or just inside in general where it may be getting more exposure to longer periods of light (incandescent or florescent lighting)? The photo-period (daylight hours) are IMO the main thing that triggers birds to begin to molt. It was also mentioned that if a bird is kept in low condition and then allowed to gorge, that can sometimes trigger a molt.
Do any of those conditions fit your case? I'm not all that experienced, so I'm not of much help but I thought I would pass that along.
“Attitude is more important than the past, than education, than money, than circumstances, than what people do or say. It is more important than appearance, giftedness, or skill.”
Thanks for the help I was able to get a hold of my vet and he explained that sometimes when they break a feather and hurt the wing (which 1 week ago she crashed really hard into the brush and broke two feathers on the same wing) that they will drop them and grow them back