The Last Witch Series by Elizabeth J. Kolodziej

Vampyre Kisses is an enthralling story about a young woman named Faith, who seems content with her life, but deep down craves more excitement. Then a mysterious man named Trent enters her world and everything changes. Surprising to Faith, Trent is a green-eyed vampire from Ireland. She is even more amazed to find out that she is a witch, and the last of her kind.

Faith learns that she is destined to restore her witch line and becomes more powerful as she gains confidence and knowledge, but danger lurks everywhere -- especially when unknown assailants steal the most important gems from the vampire master and werewolf royalty.

Now surrounded by a world filled with mystifying vampires and werewolves, can Faith gain enough power to help her friends and rescue the stolen gems? 

Last witch in the world, Faith Scott, and her Irish vampire boyfriend Trent have just come back from fighting for their lives to recover the Vampiric Blood gem and Werewolf Moon gem. Thinking they could finally relax and work on the romance growing between them, they now meet a mysterious psychic vampire named Vincent who has his heart set on being with Faith.
Soon bizarre killings of Zou Tai’s werewolf pack begin, with rumors of an alchemist possessing the famed philosophers stone being the assailant; which, causes Faith to turn to Vincent for help in figuring out why the werewolves are being murdered.
It isn’t long before all those around them test Trent and Faith’s love, along with their abilities, once again. It is all Trent can do to keep Faith safe by his side while both go up against a deadly alchemist, deceptive gods, and having to rescue the werewolf prince; yet, after a deal with the God of Werewolves will Trent be able to save himself too?