That is true. It is hard to say what would have happened. There was actually another being inside of her that eventually took control of her because of it, but it's hard to say if it would have lived if we had killed her... or if we even would have succeeded. But the wheels had been put in motion for an attack by these monsters by her father back when she was even younger.
[She didn't believe they would have prevented anything, just perhaps made it worse. There was a reason Saturn showed up and they had nearly interfered]