Hi ........... I have the same exact problem and was hoping someone was going to answer your question ........ I've been watching for responses. I have four 13 week old pullets ...... I've had them for about a month ........ last week I brought home a 9 week old. I have her separated from the others but they saw her though the fencing and I thought they were going through a feeding frenzy trying to get to her. Scary ,,,,,,, I do believe they would have hurt her. I still have her separated from the others because I was told that they should be isolated for a few weeks to make sure there are no illlnesses that can be spread to the others but I have a great fear of introducing her to the flock of four others because she is very docile and friendly ....... they will definately dominate her. I am starting to think that maybe I need a separate coop for her ...... I don't want her to get beat up in the coop at night. That will mean that I will need to get her some company because its not good to have one bird alone ..... maybe get another pullet or two to keep her company. Hmmm. Is that normal to have multiple coops in the yard. Or am I being to sensitive and they'll be fine together once introduced.