Probably a black sexlink hybrid. Her upper beak has been cut, so she almost certainly came from a high production environment. Whether she's an ex-battery layer or was raised to POL in a hatchery/production barn I couldn't say.
She looks like an Australorp to me. From what I can tell, she has the right color feathers as well as legs, beak and eyes that Australorps carry.
Does she have any golden or silver feathers on her neck?