(Book 1 of the Fallen Series) The Academy [A New Life]

Kimberely Deaver had died, due to a few demons; with a lack of reason. She awakens in a strange place, that is covered in white and has no floor nor ceilings or walls. She gets offered a chance to be reborn into the human race or if she wishes to stay in Heaven. After thinking about it, she chooses to be reborn. Just a couple seconds later, she awakens as Silena Nguyen. 18 years later, she is transported to Hell in order to complete her tasks.