Sweep of the Blade by Ilona Andrews

Maud Demille is a daughter of Innkeepers—a special group who provide ‘lodging’ to other-planetary visitors—so she knows that a simple life isn’t in the cards. But even Maud could never have anticipated what Fate would throw at her.

Once a wife to a powerful vampire knight, Maud and her young daughter, Helen, were exiled with him for his treachery to the desolate, savage planet of Karhari. Karhari killed her husband, and Maud—completely abandoned by his family—has spent over a year avenging his debts. Rescued by her sister Dina, she’s sworn off all things vampire… Read more.