First of all, she was naive and weak, but maybe she had realised there was no point in being the weak and naive little stubborn girl she once was. No matter what she did to change the future the results would always be the same, causing her personality to change over time (is what I think). Secondly, she doesn’t entirely becomes emotionless; this only happens when she’s near people she hates/dislikes. And lastly, It’s about time she takes revenge on her “step-sister” (I don’t think she had killed her in her previous life or at all. It would’ve been nice if they had shown that part in the story though).

After her 7th death, I like how her personality has changed. She becomes a lot stronger, more independent and cold hearted towards those who deserves it. Also, she doesn’t need to take revenge on her relatives or any other as she killed them in her previous life. It’s pointless if she was to take revenge every time she relives her life, it’ll be like a time loop, except the choices she makes will be different but the results would’ve ended the same. Abandoned and death