If you put a handful of fertile eggs under her in 3 weeks she won't be broody anymore.
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Thank you, I appreciate the reply......how long does it usually take or how do I know her boodiness is brokeYou can have a perch/roost in your Broody Buster cage, just no bedding. And have it set up on blocks or sawhorses, or hanging from rafters, so there is good airflow underneath her. Here in South Fla we don't have to deal with below freezing, but I guess if your other chickens are okay in that weather, your broody should be also. Just not in a cage set right on the ground. Your solution to put her Broody Buster cage indoors, with a roost, sounds great. If she still acts broody indoors, set the cage up higher.
It's okay to keep them confined for the 3-4 days needed to break their broody spell. Chickens have thousands of years' worth of domestication in their DNA, they're not wild eagles yearning for their freedom. When you let her out you can see if she's more interested in staying in the run to scratch & peck or tries to go back to her nest spot after a brief dust bath.
Your plan to incorporate space for a Broody Buster within your coop sounds smart, especially in your cold climate. But you shouldn't need a lamp for heat if the other hens aren't using one. And if your coop is dimly lit you could either properly wire it for a light or just use a battery-powered lamp to un-inspire your broody on days when it's too cold to put her cage outside in the daytime. I've heard too many stories of coop fires caused by lamps used for warmth.
But you may wish to re-consider the broody factor, especially with keeping bantams whose nature is to brood. Some hens, even bantams, are easy to discourage and may seldom if ever try again. Other hens more frequently cycle between laying & brooding, especially in the spring, and it seems unkind to try and change their deep-seated instincts.
You may want to also add some broody pens in your coop, little enclosures with room for a nest and a square foot of room to stand and get food & water. Don't put them where the other hens will see & get similarly inspired. If you don't have fertile eggs to set you should be able to find others in your area who have some. If you don't want to continue to add new birds to your flock many folks will be happy to have your hen hatch eggs for them and can take the chicks back after they're 4-6 weeks old.
Chikenbutwut, it sounds like you've got things well planned. You've got good reasons to keep bantams, and have good plans for their possible broodiness. I wish you the best of success with your flock!
What a sweet looking broody!