I was gifted three chickens for my birthday. One struggled to fit in, as he was pushed to the bottom of the pecking order, while the other morphed into the flock. However, I have one that is extremely aggressive. She goes out of her way to bother chickens from my existing flock and even the chickens that came with her. She has put a hole in my chicken's neck, almost killing her. I'm not sure what I can do to stop this aggressive behavior. For now, I'm letting her out with the others and isolating her at night. I would love some advice! Should I just get rid of her?