I understand that her (before transmitted memories) were combined with her Korean (or Japanese? not sure) life memories. But with the way she talks, I feel like the Korean/Japanese ones are more dominant, probably because of the way she constantly thinks and speaks. Although, it's quite obvious that the previous Tiararose's memories are still there because of etiquette, the mistrust in people because of her past fiancee, and also affecting the way she processes and speaks. Still, I am not shaming her for it, I'm getting quite annoyed by how insecure she is.
Also, I feel like Tiararose's thoughts on the otome game's events being absolute are false. I believe that the otome game has the event of Tiararose trying to stop Prince Aqua from going to the sea, thus the event happening. Just a theory though