The White Oak & The Dark Knight

Norah White, a seventh year Hufflepuff, is tasked with the mission of saving a certain spy's life at the request of Dumbledore. After a year of training, the time comes for her to use her abilities to save Severus Snape's life after the fatal strike from Nagini. A prophecy told to her by Dumbledore speaks of her saving the life of her soulmate, but will she be able to do it?