Turned: The Inari Council by Katherine Rhodes

Waking up dead sucks.
Cracking her eyes open as one of the undead for the first time in the cellars of Castle Pietra, Sara immediately meets her guardian—well, werewolf. She witnesses him halt her summary execution and then save her life with his blood.
His sweet, delicious, magical-laced blood.
Slowly, through his tutelage and the kindness of his family, she starts to get used to being a vampire. It’s not the best un-life, but at least she can make sure her little brother Keelan is safe and cared for.
But all it took was one winter night. A night she was enjoying with her date, Marius, and trying to live just a little bit of the life she lost when everything changed. She, Marius and Michael are pulled into a world that was darker, more cruel, and bigger than they ever suspected.
And Keelan was their captive.