The Way of Things - The Trail of the Crawford Sisters, #1

Holly Crawford has never felt at home. Left under a holly berry bush when she was just a baby, she struggles to find her place in this world, and what little hold she has on it is ripped away when her Pa decides to move them out west on the Oregon Trail. After a horrible tragedy, Holly's left alone to fend for herself in a world she knows nothing about. When all hope seems lost, she's found by a Lakota tribesman by the name of Stillwater.
Tall, dark, and dangerous as he appears, Holly knows that if she wants any chance of surviving, she has to rely on Stillwater and his people, and for the first time in her life, Holly finds that she has a sense of belonging. That is, until a strong sense of duty and a piece of her past threaten to rip her away from her new found home. Now, she must fight for the life she has grown to love, else she be torn from Stillwater's world permanently.