The Princes of Stone and Steel by Sarah Zolton Arthur

She must remember the past to save the future.

What starts as the abduction of Millie Merchant turns into an awakening of bitter truth. Her life is a lie. Her family a fake. It’s all been part of an elaborate hoax to keep her from her destiny. A destiny that lies in the land of Roshambo.
The lines between fantasy & reality blur as she’s transported to a fantastical realm boarding on extinction. Struggling to make sense of it all, Millie is presented with two princes determined to win her hand. One has her best interest at heart, the other seeks control of the realm. But who can she trust in a world full of strangers?
War is looming. Nightmarish beasts prowl the lands. It falls to Millie to be the salvation of Roshambo. For she alone is the ruler the Outliers have been searching for. The origins of rock, paper, scissors come alive in a tale far more twisted than a simple child’s game.