I don't think she doesn't believe she can die. I think, just like you always did, she believes there are things worth dying for.
Cassandra ClareIt is the mundanes who look at me and see something they do not understandโa boy who is not quite white and not quite foreign either." "Just as I am not human, and not demon either," Tessa said softly. His eyes softened. "You are human," he said. "Never think you are not. I have seen you with your brother; I know how you care for him. If you can feel hope, guilt, sorrow, loveโthen you are human.
Cassandra Clare