Denverchickee, it depends on how committed you are to keeping her in the flock. Taking her out of the run and/or putting her in a "jail" run inside the larger run for a few days might help. Picking her up and carrying her in front of the others might help. For sure, any time she challenges your leadership/authority, put your hand flat on her back and make her squat as if you were the rooster, and hold her down until she stops struggling. If she tries to out and out attack - comes at you kicking out as if she had spurs - fling her off with your foot. She does look like a cross, but it's always hard to predict how that affects egg size/color. Chicken keeping is not supposed to be a hassle, it is supposed to be a pleasant and productive activity for you and your family. There is not only no reason to keep a mean chicken, there is every reason to not keep her. It creates chaos in the flock and can limit the productivity of the rest of your girls, and in some cases keep them from getting enough food, water, and exercise. If you are unsuccessful at correcting her behavior, particularly once she begins laying, which I would think should be anytime now, she should be relocated, whether to someone else who wants to give her a try, or to your freezer. Last year one of our list members was able to relocate a mean hen to someone who had a rooster, which seemed to have corrected her idea that she was in charge of all she surveyed. I'm not being mean, and I apologize to anyone who thinks I am. I am of the very firm belief that mean chickens have no place in any flock, but especially one where an unsuspecting person might be harmed or frightened. I had dogs for many years, and felt the same way about a dog that was willing to bite a human or terrorize other dogs. They are not balanced/healthy mentally, and most often are unhappy or fearful, which is a terrible life for them and for all around them.