Ohhhh so lemme get this straight, the villainess dies and is reliving her life from 3 years ago, but this time without her magical capabilities, and the MC/Saint is from our world where the story takes place in an otome/rpg game and was isekai'd. Judging from her actions, I'm guessing that she'll get impatient/frustrated bc nothing is unfolding the way she knows it to be (obvs since the villainess has been reborn). And when she realizes that she isn't getting bullied, she'll try to rile up the villainess into bullying her/spreading rumors and eventually both of them will confront each other.
I like it. It's two pretty good tropes [(was reborn a few years into the past after my death, thus I know how things will play out) and the more popular (I got isekai'd as a character from this otome/rpg game that I am obsessed with so now I have knowledge of the future)] rolled into one manga, but with a twist since both are here at the same time and the villainess has ~0 magic unlike last time/the game. It would be pretty amusing to watch how this plays out honestly.