beta
I think the crown prince death is forced to happen cuz of the original plot of the story that the MC's reincarnated. It's a natural course of event. She only managed to extend his life but probably can't change the flow of the plot. After all she said that they are already near the start of the original story since the MC heroine was about to enter the palace.
Since most of the characters are based on authors and there's literally magical "book" & "page" in the story, probably the next few chapters are about rewriting the events by going back to the past.