Human No Longer, a vampire novel by Kathryn Meyer Griffith:

Jenny and Jeff Sanders become victims of a bizarre crime; leaving Jeff dead and Jenny in a temporary coma. She returns to her children. With Jeff’s death she must move back to her childhood home, a haunted farmhouse, in Summer Haven, Florida, where once they destroyed a family of vampires.

Jenny has no appetite. She’s edgy. Her eyes hurt. She thinks it could be trauma or grief. Until one night she can’t resist the night woods or the overpowering urge to drink warm animals’ blood–and accepts the truth. Her attackers were vampires.

Now she’s becoming what she once reviled. She can’t abandon her children but must find a way to live in the human world. At night she hunts, in the day hides what she’s becoming and attempts to fit in.

Then townspeople begin dying. Like years before. With her blackouts, she fears she may be the killer, or is it her vampire attackers? For they've found her and demand she joins them–or her family will die. She resists until they kidnap her children. Then she has to find a way to outwit and ultimately destroy them. ***