I have three hens. All about 6 months old, the largest Isa Brown is at the top of the pecking order. I got two silkie chicks a few weeks ago. They are almost 10 weeks old so I thought now was a good time to add them to my flock. I added them yesterday and it seemed all heck broke lose. The top Isa, started fights with everyone. She fought with the barred rock I have who's the most gentlest and kindest of the three grown chickens. And now today she won't let the new chicks come out of the nesting box area. I went to check on them this morning and they were huddled in a back corner of a nesting box. If they even tried to come out to eat or drink the Ida would run over and start pecking them. I couldn't bare to watch, all I could here was little screams coming from the chicks. This happened 3 times while I was outside. I'm not sure what to do or if it will just handle itself. I don't want her to kill the chicks but wasn't sure if this was normal behavior. Is it time for her to go?