It can be small things that can cause a bird to pluck so fingers crossed having some extra stimulation by looking out of the window or just even a little more sunlight may be the anwer?
Its definately worth trying the aloe vera too though, you can get it in health shops, or even on the internet.
The Aloe Vera get buy to drink would be find to spray her with too, as long as it's pure and not got lots of additives in it
I'm about to go on the hunt for some myself, for my newly acquired plucked bird
