Once upon a river : a novel / Bonnie Jo Campbell.

Enhanced descriptions from Syndetics:

Bonnie Jo Campbell has created an unforgettable heroine in sixteen-year-old Margo Crane, a beauty whose unflinching gaze and uncanny ability with a rifle have not made her life any easier. After the violent death of her father, in which she is complicit, Margo takes to the Stark River in her boat, with only a few supplies and a biography of Annie Oakley, in search of her vanished mother. But the river, Margo's childhood paradise, is a dangerous place for a young woman traveling alone, and she must be strong to survive, using her knowledge of the natural world and her ability to look unsparingly into the hearts of those around her. Her river odyssey through rural Michigan becomes a defining journey, one that leads her beyond self-preservation and to the decision of what price she is willing to pay for her choices.