Death, War, Famine, and Conquest wasn't part of what the ancestors had decided, but to Princess Diana, she was able to sacrifice her own self to establish her own peace within the world, and that peace was in order to restore her people and her nation of Tyra. 

She will risk anything for her people, nation, including the dragon blood she has within herself, Even risking herself to marry off the most powerful foe, that had begun their war against her nation's name.