Trail to Her Heart — Alysia S. Knight

Jessica Wellington flees her home to avoid marriage to a man she despises. After disguising herself as a boy to join a wagon train, she's soon discovered and must choose whether to be left behind or marry the man who'd sworn to protect her. Nathan Hawke keeps his eye on the mysterious young boy who joins their wagon train, but when he discovers she is a woman and wants a marriage of convenience, he thinks there is nothing convenient about it. Now, he must figure out how to keep his new bride safe on a trail filled with dangers, while staking his claim on her heart.