You separated her, right? Try putting some eggs in a nest with her, and see if she eats them then or not. If she seems to leave them alone, then maybe you can try other hens that way, one at a time. Better yet, you could try the roosters that way, and see if one of them is breaking them, first.
All of my hens will eat cracked eggs. But none of them purposely break eggs that are in their nests. It's so funny because if I go to grab an egg, the moment it floats out of the nest, the hens are on me like "ARE YOU GOING TO BREAK IT FOR US?!?"
But as long as it's in the nest, it's a no-touch zone, unless it's already broken.