Bloodlust.

BLOODLUST opens in a blaze of blinding white light as young Maria Hunter races through her blood-spattered home to her parents room as they are being killed by a vampire. Hunter and her infant brother are adopted by the Church and grow up in a warm and loving environment until one night when the vampire who murdered her parents savagely kills her brother. The enraged Hunter leaves the secure confines of the Church on a crusade for vengeance on the creatures responsible for stealing her family from her.