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You could separate her for a week or longer from the others and see if this will stop the overall aggression. Sometimes separating the instigator can make all the difference. Or add the most aggressive of the older flock as last bird to the new merged flock, so she will lose her top rank. And...

When there is strong aggression it can lead even to deaths, so I would not let them "just work it out". Watch closely to find out the most agressive birds and separate them away from the flock. When the younger birds have recovered from their injuries maybe try this: You could try the...