Stsr Was. The New Jedi Order.

Jaina never thought that she would leave the planet of Tantooine, but her life is turned upside down when she meets HK-51, a droid with a big secret. Like it or not, Jain is about to be caught up in something much larger than herself, a galactic war between the evil Galactic Empire and the fledgling Resistance. But something is awakened inside Jaina, something that might turn the tides of fortune in the galaxy...