Why this thought? Because I don't have a rooster since I don't have a setup for chicks and just have hens for eggs for myself. For non chicken folks broody means she is nesting on the eggs for them to hatch. And once hens go broody they stay that why until they hatch their eggs and will work themselves to death if the egg(s) don't hatch.
So to snap her out of it someone online suggested I cool her belly. Since I like immediate action I decided at 9pm I'd go grab her and try putting a bag of frozen peas under her belly. After a couple minutes of standing outside holding her I decided I was bored so I did something I thought I would never do...brought her inside the house and sat on my couch with her & we watched tv. (while holding the peas to her belly) Mary Kate just sat there and watched tv and enjoying the strange looks the dogs were giving both of her and me. After about 20 minutes I removed the peas and I took her back outside. Sat her on the roost & to bed she went.
I was happy this morning when she woke up that she didn't immediately return to the laying box to nest and joined the flock to free range. Came home from work to find her still free ranging with the flock :)
Problem solved (for now until one goes broody again). So at least now I know what to do to snap my hens out of wanting to be momma's. But now I have a new problem today...Mary Kate is hanging out by the back door waiting to come back into the house to hang out.