She has always been something she never was.
When she thinks about how she grew up in her kingdom near the beach, with people calling her 'princess' and her father and mother 'king' and 'queen', she sometimes has to smile. And then she remembers it has always been a lie, for more than twenty years before her birth, they had become part of the Magedom and she has never been a princess at all.
Just a lie. Just an insignificant girl in an insignificant place, where people remember old times when their leader was not just Viceroy but a true ruler so fondly they still call him by his old title – another lie, for in the next sentence, they talk of how their country has flourished since back then.
So when the Magelord speaks of making her his empress, she listens eagerly, wishing to be something more, something real, something not just an illusion like she and her home have been since the beginning of her life.
And then she leaves her smiling people and her loving parents and her home by the sea to live in the Mage City. The wedding is grand, with everyone cheering and shouting and waving. In this moment, it does not matter that she is only the Third Empress Consort now, for an empress she has become.