Some folks will tell you that they never separate their broodies and everyone does just peachy. While that is possible, I think it's ideal to move a broody to her own separate quarters. Or make a barricade around her. She'll certainly need to be protected from predators like foxes & raccoons. And protected from interruptions & interference from her flockmates, who will want to push her off the nest so they can lay their own eggs there. It's also helpful if the broody is confined to her nest area so she won't get misdirected on her way back from her daily coffee break, and go to set in another nest, leaving her egglings to cool.
She'll just need a square foot or two of space to get up, stretch her legs a bit, get some food & water, and take a big poop. A wire dog kennel could be used, even placed indoors or in a garage. Or stretch a bit of wire around & over the area in front of her nest box.
If you plan to move the broody from her current nest, do it quietly well after dark for best results. Some broodies don't like to be moved, but if you do it after dark they may not notice the change.