We have a 3+-year-old Barnevelder chicken. She is done molding for the year. She also recently lost her sister chicken to infection. A few weeks ago her behavior changed. She will not come down off the roost for long periods of time. She is not nesting so I do not believe she is Broody. We have four other chickens. When she comes down she tends to run away from them or steer clear of them which is a new behavior for her as they have been in a flock together for over a year. She seems extremely anxious. She is eating and drinking but it is only normally when the other chickens are not nearby. Other times she is usually up in the roost if she is not eating. She is not foraging like she used to. Interestingly, we are barely getting one egg from her for other chickens. We are afraid that her presence in the croup is making the other chickens lay outside of the box. Any thoughts?