Chicken Question

Two of our hens--Buff and Sunshine--have been brooding and hopefully are getting out of the stage pretty soon. With brooding, they enjoy being in their nests for quite a long time and want to be mothers, so they pretend they are laying on eggs. But, we can't just leave them in the nests every single day. They have to eat, drink, and roam around to get exercise. So, Josh placed some bricks in the four nests so the two brooders can't be in the nests. However, our dear hen Cole isn't brooding and still lays eggs. What do you do, those who have chickens, when some of them are brooding and some aren't?

~Rachel M.