
Alright, let's enumerate the regressors in this story.
1. The empress
2. Her sister
3. The btch
As we all know, in the previous life, the protagonist's family were executed for the shit that they did not even do (let's thanks the btch for that) then the btch became the queen. Viola!
The nobles were all against that, so after sometime, since they cannot accept that a mere baron's daughter became their queen and the said btch overspending is a huge problem. They kicked the btch out of her position and executed her since her accomplice Duchess Ephreny testify of their frame up they did from the late Queen which resulted to death. The btch was executed as well. Then the nobles made the king step down from his position (which he surprisingly did without a fuss as if he doesn't care anymore)
These are the spoilers for their previous lives. So, want more? Bcos I know, I'm disrespecting others who's waiting for updates too.

So this means that she actually did not prepare for mc to be the one to marry the emperor. And if by accomplice Duchess Ephreny you mean the original duchess and not the mistress does that mean her strategy change was to support the mistress instead of the duchess or did I misunderstand something?
And it's kinda dumb that she's literally doing the exact same things repeatedly. Like if her overspending was a problem in the past she should figure out a way to...not? How could she possibly need more money than allotted for an empress after she became one that they had to execute her for that?? Bruh

She's a straight up stupid. Really. Yes, you're right. In her previous life, she turned herself to the Duchess because she's a capable one. And in her second life, she choose to blackmail the Duke and conspire with his mistress.
Right? She's so dumb. Mind you, she never considered overspending as a problem. She's selfish and stupid.
Who wants to know the ending. Oh God, I got so invested on this that I actually read the novel straight up. And I'm quite happy with the ending.