I have a 10 yr old female cockatoo named Bella. I have had her since she was 3 years old and she is my big trouble maker. Does anyone have any idea why after years she has always liked going out of her room and with me in the house and going outside but now she bites me if I try to leave her room. I don't know of any bad experience she's had to make her act like this. Anyone have any ideas?