"Magyk" by Angie Sage

Imagine that you're running down the grey streets of the castles' town. You happen to be an ExtraOrdinary Wizard. You're name happens to be Marcia Overstrand. it is a snowy day and you are carrying a baby into the forest, and to place it in the perfect place so that you're "dearest friend", Silas Heap, will happen to walk by this baby, and take it home to his seven children and one wife. You know that you must make Silas promise to keep this baby a secret. for it is the Queens' daughter, and you have just witnessed the murder of both your queen and mentor, yet still managed to save the baby girl, who will one day grow strong and make a wonderful queen, just like her mother.
Ten years go by, and you've managed to continue to keep your secret silent.
But you figure out that you're not the only one who wants the princess. you want her to keep her safe, but the custodian guards need her to complete their mission, to kill her.
Go. run to the Heap family. save your princess Jenna. 
well what are you waiting for?!  GO GET HER....
Its' basically like kidnapping. they are after you. all of them.
Even the hunter.
Though Jenna can't part from her family easily, she has a strong tone in her voice. she understands what Needs to be done. she knows that losing to the hunter means death. an pain. and loss. she, and Marcia, Seem to be the only ones who have gotten this looped into their minds.
It's only what's right.