I have had chickens a long time and never have I had a chicken that had continuous bad behavior. I'm hoping your chicken settles down, and I believe she will. I would also check to make sure she's not under any stress... :) and can get away from any bullies.
I had a chicken that was constantly flying at my leg, (she was the most picked on bird) I read (probably on this forum) to pick her up and carry her around with me like a football for a few minutes, backwards, and that seemed to work.