The Savior of the Broken TSotB

Lucy Ingram is your average teenage girl, the parties, boys, all of the above. Her life goes from just laughing along with her best friend Alex, to pain and loss, in a matter of days. She is taken by mysterious people who claim they want to make the world better, and when Lucy refuses to join their cause, they resort to breaking her. They want her to be their leader in the "revolution against mankind".
Will they break her, or will she fight against them until the end?
What will she have to sacrifice along the way?
What will happen to the world when people start to hate its ways?