You have two options: you can 'break' her. This consists of putting her in an elevated wirebottomed cage, this allows air to flow under her and lower her body temp (which is what causes broodiness)
Or you can allow her to hatch the eggs. If she has more than 5 or 6 under her, I personally, would bring the numbers down. Having more than 5 or 6 possible chicks gives all of them the best shot for her to keep them under her and warm. It is also hard for a broody to keep track of more than a few chicks (imagine 6 children vs 2 or 3!!!). It is also a good idea to mark the eggs so that you know which ones she started with.
Good luck!
