Thanks Donna for this suggestion! A little trivia —> This author was the sister of Anne Rice.
Into decadent Rome of the Dark Ages comes Regeane, an enigmatic young woman distantly related to Charlemagne. But the blood she has inherited from her murdered father makes her much more than a child of royalty. Regeane is a shapeshifter–woman and wolf, hunter and hunted–possessed of preternatural agility and strength, primal memories extending back thousands of years, and senses so keen they can pierce the veil of death itself.