That is interesting, of the 4 BA's I've had only 1 has gone broody. I had her raise 2 of the batches from Meyer.
Where do you get your chicks? I've not heard of Starlight Green Layers or Prairie Bluebells. My 2 Salmon favs (from Ideal) were never good layers, SOMETIMES managed to squeak into the USDA Medium size and are broody several times a year. One died a couple of years ago, the other is 7.5 years old.
I TRIED to give her day old chicks this year but she wasn't having it so they went under the big BA who was also broody at the time. But soon as the Fav was broken, she started hanging out with Zorra and the chicks, same as she did in 2015. And same as before, she stuck with the chicks for at least a month after Zorra kicked them to the curb.