Forgotten Truth Truth Series, Book 3.

Alissa is the only student living in the Hold, learning a millennium's worth of magic from the last surviving Master. Even shape-shifting to her dragon-like raku form is becoming second nature. But when a spell goes awry, Alissa is transported back four centuries to an era when the Hold and its city thrive with magic students and their tutors. Separated from the man she loves by four hundred years, Alissa's distress and confusion are causing her...