The Younger Sister of a Villainous Daughter Who Remembered Her Past Life One Day

My name is Isabella. One day, I remembered my past life from the impact of hitting my head! According to those memories, it seems I've been reincarnated as the villainess in an otome game. I have a feeling I was already bullying the heroine's younger sister, which is bad!!! I need to apologize right away and keep my distance from the prince who might break off our engagement... This is a story about a younger sister heroine whose spirit is being worn down by such a templated reincarnated villainess. The protagonist is a non-reincarnated person. There is no such thing as a comeuppance story.