GIRL IN DISGUISE IS THE PRINCESS!

A 17 year old girl who's Reincarnated into a unknown magical world. She bewitch died mysterious hence and reincarnated as a Princess.. But she is not a normal and fine Princess in the story,She will have a hard time believing her own will that she will die by the unsipsose age of 18 in the world she is living now.. What will she do to avoid that destiny of death?