Type into the search box "breaking a broody." Some say that if you place a broody hen in a wire kennel (a rabbit hutch, dog kennel, etc.) that is raised off the ground (I guess to help with cooling/air flow) with no bedding, only food and water, and keep her there for a few days, it usually breaks their broody spell. Others say dunking them quickly in cold water will do it (I personally find that one a stretch). Many just keep tossing them off the nest, which sometimes does the trick. I have a broody now (no rooster) and have tossed her out a few times, mostly to make her eat/drink, but she goes right back, and I've removed the eggs (even the wooden plant egg). Since she's my only one, I'm just gonna let her sit it out. But you could try the "broody breaking box."