Revealing mistake: Right after Nell sends Hugh to hell, Dr. Marrow and Theo come out of hiding behind a pillar. As Marrow puts his hand on the pillar, it squishes in as if it was made of foam rubber, instead of stone. (01:39:50)
Revealing mistake: When Luke tries to ram the gate with his car, a huge piece of spear-point wrought iron falls and impacts the roof of his vehicle. As the others rush to rescue Luke from the car, we can see the wrought-iron spear points flexing and bending, because they are made of rubber.
Answer: She has faith and the courage to face him without fear. After years of bring used and abused, she finally had enough. The only way to conquer your fears is to face them.