I recently had a broody hen, nothing seemed to break her. I decided to bring her inside the house for an hour or so. The kids played with her and held her. She also ate and drank while inside as well, where previously she had no interest. Maybe a radical change of environments was all she needed to come around. I put her back in the coop and she jumped up next to the others on the roost. Next day she was back with the flock....not saying it will work all the time, but in this case it did.