Order of Succession by Alaina Stanford

As the second in line for the throne of Chelyana, Kaelyn grew up sheltered from the harsh reality of the impending galactic war.Then one day, Chelyana's attacked by a hostile race determined to devour the planet. Suddenly the fate of her people lies in Kaelyn's hands. She races across the stars in a small starfighter, toward the only man powerful enough to save her people, her fiancé, Chord.

With mysterious warriors close on her heels, she fights to stay alive long enough to save her planet.

There’s only one problem, Kaelyn's pilot is the love of her life…