Aggression in chickens is a little like aggression in dogs. Not all chickens are the same and not all dogs are the same. Conditions can play a part, but some individuals are just a lot more aggressive than others. You can make some breed generalizations, but it often comes down to the blood...
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I would take the Wynadotte out for a time out to change the pecking order.
That's what I would do, too. You might want to consider taking her out of the flock as a long term solution, too, if you can't get her to tone down her aggression after you try some different things. I know...
My older books on chicken keeping did warn about the potential for aggression problems in mixed breed flocks. I didn't mix breeds until my later flocks, starting in the early 90's. I've had trouble a couple of times.
In general, if you don't mix higher strung, more aggressive breeds with much...