We had a BO broody hen a few months ago. All I did was remove her from the nest box several times a day to make sure that she got some food and water. It took about 6 weeks, but she finally stopped sitting on her own. IT was very exciting that one morning when I opened up the coop and she was the first to run out!
She lost some weight (not gained it back yet) but she seems healthy enough and acts like her old self now. Still not laying eggs again, but I imagine that could take longer because there is less daylight now.
Good Luck!

Good Luck!
