Do you WANT her to hatch chicks for you? If you do, you really don't need to "help" a broody. They can hatch and raise chicks with minimal interference from us. Some people will section off a portion of their coop for their broodies to keep the other chickens from laying in their nest and adding to them. That doesn't work for everyone. When I've had a broody in the coop, I draw a circle around the eggs with a Sharpie so I know at a glance which are hers, then remove any donations every day.
Whether or not I separate my broodies, I make sure they can get off the nest to eat, drink, dust bathe and poop whenever they want. I don't feel right about locking one up and only letting her stretch her legs when I can get to her. You don't want to put food and water where she can reach them from the nest. She needs to be able to get off the nest to do that or she may poop on the eggs, potentially killing them.
If you don't want her to hatch eggs, you need to break her.