The Princess Will Save You (Kingdoms of Sand and Sky)

"When her warrior father, King Sendoa, mysteriously dies, Princess Amarande of Ardenia is given what would hardly be considered a choice: marry a stranger at sixteen or lose control of her family's crown. But Amarande was raised to be a warrior--not a sacrifice. In an attempt to force her choice, a neighboring kingdom kidnaps her true love, stable boy Luca. With her kingdom on the brink of civil war and no one to trust, she'll need all her skill to save him, her future, and her kingdom"--