neotoma

Sabriel is the first book in a fantasy trilogy (usually called the Abhorsen trilogy or the Old Kingdom trilogy) by Garth Nix. The other books are Liriel and Abhorsen. Sabriel is also the name of the eponymous book's main character--a young woman who's a special kind of a sorcerer called an Abhorsen; she fights necromancers and evil Free Magic creatures and puts the unquiet dead to rest.

And I totally understand how signing up for anything can be insane when your work schedule is too hectic.