Have you recommended a novel about rebirth in ancient times?

The female protagonist was originally a princess, but she died due to poor health and was reborn in the same dynasty at the same time. Later, she became the male protagonist's princess, and later, she seemed to have become the empress (I don't really remember). There was a plot in which the female protagonist was forced to watch the execution by the female supporting character. She fainted for a long time because of fainting from blood, and her reborn soul was unstable. Thank you for browsing and replying ~~(>>)/~ The male lead was a prince who had mysophobia and later became an emperor. The male protagonist also had a particularly close nanny who did not like the female protagonist very much. The female protagonist's mother was the Eldest Princess.