Anger
I swear I just saw Sydney furious at the chicks. She was making a sound that scared me. She was trying to get Lucky and Ned to go across the side yard with her and they were roosted on my chair and would not come to her. She stood in the side yard calling and complaining. Eventually she walked over to the chair making that "complaining" sound and the chickies jumped down and she stopped.
When I first saw her standing there making the sound I thought she had either lost the chicks or they were dead. She seemed that distressed.
I guess the chicks are preteen now and starting to have attitudes.