So, We have a total of five chickens, a young rooster and four hens. Grrrrr(yes that's her name) and Lucy are the moms of ALL of our chickens and their mate(our alpha roo) recently was attacked by vicious dogs while defending his flock and didn't pull through. Anyways, Grrrr has always been mean. She pecks when she is sitting on eggs/ chicks and is mean to all the chickens but today she crossed the line. The young roo(only one we have) was mounting Blondie and Grrr ran up and started pecking Blondie on the back of the head. Blondie now has a beak-sized hole in the back of her head but won't let us get close enough to treat it. My mom thinks the pecking order is being re-established due to the loss of our roo. My Dad thinks it is not a phase and Grrrr will continue to hurt Blondie until she dies. What should we do? Thank you!