If you aren't going to let her hatch eggs, waiting for her to stop on her own is a bad idea.
Sometimes they never stop till they can no longer move on their own. A friend of mine had a broody turkey hen she didn't break. When she finally realized there was a problem, after a month of physical therapy and $2000 of vet bills, it died anyway.
Letting nature take its course is allowing a hen to raise a brood of chicks. That's what they would be doing in the wild.
Let me guess, your hen is either a silkie or cochin. ?