I think you miss the point here. She seems to be playing a dangerously self-destructive person. Normal people seem to be okay with living boring happy lives, but in contrast, she is basically staring death in the face and is okay with it. Destructive relationships and habits are part of it, but any way you look at it, she is not playing a normal person. This is not a battle against death. Death is her friend. This song is brilliant, but you have to be a little nuts to really understand it.