For the past 4 years I have kept a male and female pair of blood parrots. They got along splendidly and never fought. During this time both the female and the male where incredibly docile and took food from hand. Then 3 months ago the male passed suddenly overnight to health complications, and her attitude turned sour. She became incredibly aggressive, going after my hand when I'm vacuuming. She has on more than one occasion managed to draw blood and tear skin. Nothing major, like paper cuts, but is there anything I could do to reduce her aggression? I've looked into dither fish but my fear is she'll kill even the bigger fish as she has remarkable control over her mouth for a parrot. I've no interest in another parrot for her. She is about 8 inches and the juveniles are small.