Gods chosen one

This story is about a girl that God has chosen to save all. She is on the road with Sam dean and he boyfriend/best friend John. She's known John for her whole life and she loves him. She is scared that he is going to die like her parents did or she might die like God said she would. One thing for sure she is scared. It is time to help the angels, fight the Demond's, and kick some since into dean.