Your sweet little broody is overcome by hormones, and we want to get her back to normal as quickly as we can!
I recently had two broodies two weeks apart. The first one was my very docile Black Cochin Morgan. I made a broody cage out of an open-mesh steal patio table and a milk crate. During the day, I set up the broody cage inside the pen so Morgan could be with her flock and not be as stressed out. I would let her out every two hours to eat and drink and stretch her legs. As soon as she headed for the nest boxes, back into the cage, she went. At night, I moved the broody cage with its inhabitant into the garage. I didn't bother with a light, but a light on all night will help to break the broody urge.
The thing that really hurried up the broody-breaking process was putting a fan under the cage so that air was blowing very gently on Morgan's underside all night long. It took a little less than three days, and Morgan was back to normal. I figured she was broke when she didn't head right for the nest box when I let her out.
Two weeks later, Irene the GLWyandotte, went broody. It was Irene's second time broody, her first being last year. Irene is less than docile when she's normal. Irene broody is a chicken version of a wild-cat - screeching, clawing, biting, and chicken profanity! But Irene was also broken in just under three days with two nights in the garage with the fan blowing on her over-heated under-carriage. It took Irene another couple days to get the broodiness fully out of her system, though. She would pause, puff herself up, flap her wings, and shake herself out, while letting loose with a pent-up "Skreeeeeeek!" Then she'd go back to whatever she was doing before the spell overtook her. It was pretty funny.
Hope this helps! Good luck!