I have 10 hens that are 19 weeks old. They have all gotten along beautifully until yesterday. One Red Star started attacking another Red Star. It was brutal. I separated the attacker and last night put them all in our new, large run that we just built. Again, the same hen attacked the same red star. I separated the attacker for the night and this morning put them all out to free range and the same hen attacked again. What do I do? We are leaving on vacation within the week also. Do I get rid of the aggressive hen?Thanks so much for any advice. Amy