Hi! I have an existing flock of 8 hens from 3 different flocks that all get along. I bought 2 chicks and thought I'd add them to flock the same way I did before. There were no issues before, but before the amount of newbies were more than the existing ones. The chicks are now pullets - one of them about as large as 2 of the hens. The smaller pullet, when being attacked flies or runs away....no problem. The larger one just cowers and lets them peck her!!!! Last time I tried to let them together 4 hens attacked her. I'm afraid they could really hurt her or kill her. I don't have any roosters. Any ideas?