This same hen has gone broody 2x more since I first posted. Little bugger! The others have not gone broody at all, thank heavens. She just spent 4 days in a cage. It was so hot I was worried, but she made it.
Just letting you guys know, I placed her in a cage as suggested. It took about 3 or 4 days to break her. It was actually pretty easy. So far, out of 14, she's the only one to go broody so far. (Knock on wood.)