Mountain Princess. The Rise and Fall of Princess Talia, #1

Hidden within an impassible mountain range was the small kingdom of Hilland. The crown princess, Her Royal Highness Princess Talia VI, was meant to get married to Prince Bleeker of Lolland. The two neighboring kingdoms had been at odds with each other for centuries. Except that Talia really did love Bleeker, and they were both looking forward to their marriage. But on the day of the wedding, Hilland was attacked, by Lolland.
No one who was in attendance at the wedding survived. No one but Talia. Left alone, surrounded by enemies everywhere, Talia is forced to escape her own home. She finds protection and love among her subjects, though most don't know that it is her. A royal in exile, within her own kingdom, Talia is left to pick up the pieces of her life. To find some semblance of normalcy with the enemy all around her.
Knowing that most of the people, her subjects, would want her to reclaim the thrown from Lolland. Knowing that trusting the wrong person would mean her death.