"Sweep" by Cate Tiernan (Sweep series, Vol. 3, containing books 7, 8, and 9)

The Calling (Book 7) -- Morgan and Hunter travel to New York City, Morgan to seek out information about her birth parents and Hunter to continue his quest to end the deadly Woodbane conspiracy. But in their search for answers, they find themselves in terrible danger. 

Changeling (Book 8) -- When Morgan receives a shocking revelation about her family, she’s thrown into a moral tailspin, believing that her essential nature is evil. Is her dark heritage too powerful to overcome?

Strife (Book 9) -- Morgan has been so involved in the world of magick that her parents are furious with her for neglecting school. And now the members of her coven are being persecuted. Morgan is falling to pieces. How can she find the strength she so desperately needs?