I would keep it where it's convenient for you. Usually it's best where the rest of the flock can see them, but since it's only a short time you can generally get away with it wherever you need it.
Usually this time of year I'm breaking multiple birds, especially my bantams. I have left them...
It's normal for broody hens to be picked on. All their clucking and puffing up seems to irritate other birds.
The kindest thing to do is to break her by placing her in a wire bottom cage elevated off the ground. It takes 3-7 days depending on how long they have been broody. Provide a perch...