She's already telling everyone that someone is going to die. How much effort or how much worse would peoples perception of her be if she simply explained herself better? All she is doing is saying that someone will die without any further explanation. Adding that she can see into the future and...
So all the though bubbles of her repenting and not remembering was just the author lying to the reader? Kinda shitty honestly. It be fine if she lied to other characters but this is even beyond lying to herself. This is the author straight up lying to the readers for the sake of a plot twist.
How hard is it to just explain how you save people? This is just a trend I see all throughout manga but why are so many incapable of communicating clearly? I it just a trope in fiction that somehow started way back when or are people in japan just like this? There is so much of it that I can't tell.
Why did he become the crown prince? Shouldn't the first princess be the heir? Or at least some of the kings children? I guess the king does what he wants.
Would be interesting if there was a story like this where the author gets into the story they created and be like "I am your god. I created you to the people"