The Baby Saint wants to avoid a bad future; you will give birth to me later

The protagonist, Ibuena, lost her parents at the age of six and became empress under the will of her father, who was a prince, but in reality she was used by her uncle and led a miserable life. As her country crumbles under her uncle's schemes, she decides to travel back in time with the help of a book left to her by her mother, who was a witch. However, she travels back in time to a world shortly before she was born, and Ibuena herself has become a baby! After spending some time in the past, Ibuena realises that there were many unnatural aspects to her parents' deaths, and decides to protect them in this life and change the future. As a baby in the world before her father and mother met, Ibuena's challenges begin..!