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Could be from many things. How was she transported? If she was frantic in a cage that would do it. Too bad you didn't get 2, that might have kept her calmer during the trip and now in isolation. You'll need to check her over real well for mites and/or lice anyway. Google images of lice/mites...

How old is the new bird? Is she alone and separated for quarantine? Maybe there are tiny bugs that you can't see? Earplugs might help you.