Please don't tell me we're entering the worst part of this kind of story,
I mean when the villain is using dirty tricks to humiliate/poison/kill the MC all the time but all the MC is doing is just suffering and defending themselves by finding flaws within the villain plan and that's it, no counter-attack, nothing to finish this bully...Assassination events, just because it's the MC and the MC has to be a nice character and it's just stupid and frustrating to watch this over time...
Seriously, the moment she got reincarnated, you just find her (even if you can't find her you just have to make a plan for the moment she will appear because you already know when she will stop hiding herself) and kill her, she's just destroyed your life and killed you by your own family. No one would have suspected the MC, and no one could say anything since she still wasn't presented as a "member of the family"