so, I have a chicken who always challenges me and comes at me (sometimes I think it's a roo but it looks like the rest of the pullets), but will not go in the coop at night... I always have to chase it around, catch it and put it in. Is it the dominant pullet (they're 10 weeks) or is she the bottom of the pile? I have noticed that when they're roosting, there's always one bird left out... I think it's her but the way she goes at me sometimes makes me wonder? Any thoughts? thanks