(Broody: being in a state of readiness to sit on eggs to hatch them; marked changes in behavior and physiology <a broody hen>.)
Each time I looked for her I found her in the coop, sitting on a nesting box. She clicked at me, gave me the chicken eye, puffed herself up and went back to sitting. After removing very warm eggs from under her I let her be.
So yesterday Sweetness was locked up in Broody Detention. For the next few days she'll be in the garage housed in an extra-large wire dog crate. We have a little fan set up and the airflow through the wire cage is supposed to bring her body temperature down and (hopefully) snap her out of her broody ways.
The other Girls have been visiting her and sharing a snack or two.