i have a very small flock. four girls & one big rooster. my barred rock used to be so bossy & sure of herself. she was top girl. she has changed. she is nervous, avoids the rooster like crazy & has a different voice - a nervous unsure of herself voice. she isn't the top girl anymore & just kinda stays on the fringes. she has been like this for a couple of months now. what would explain this behavior?