It happens is she a first time broody?
If you havent a incubator, and the broken eggs was not rotten you would smell it.
Have you a garden propergator electirc one, that runs the same temp as a incubator, mine does and I use mine as a brooder when chicks hatch.
Put something soft in the bottom and check the temp. 38C vents closed
place the eggs on their sides X and O on the shells, and turn them at least twice a day like morning and night.
It might work but it gives them a chance
