Later, towards the end of the novel, it seems the baroness has isekai'ed into an otome game where the MC is a villainess. It appears she was pursuing a harem ending and when the MC didn't act out her villainess' role per the game, the baroness tried as much as possible to recreate its events. Still, there isn't a lot of time given to these ideas and/or the background of the baroness.

Similarly, I don't understand the actions of the MC's brother--in both the original and current timeline. How could he allow the person he loved to marry the Crown Prince? Also, why did he mu*der his parents and/or not question their deaths? Unless the baroness' influence brainwashes him, his cruelty seems excessive. As mentioned before, a more complex motivation would've benefited the story. Maybe he was always power hungry and was looking for a way to remove his parents or some such more nuanced position instead of blind love could've fleshed out the story. I have the same complaints for the Knight character and Minerva. What was the Crown Prince's faction's goals besides bankrupting the nation?

Moreover, the explanation of the time travel, i.e., the magic wand and the foreign prince's actions seem rushed. Also, why would Lucia even care about the MC after she died in the original timeline? How would she know where she was buried?

The reason why she turned back time was also clearly explained by ML (Aldam, the neighbor country crown prince). In his kingdom, there's relic that had an ability to go back to the past. The royal family of ML's kingdom could use that power but he still needed something that had a strong affinity to the past. He chose to use MC's remain (kind of disturbing if I may say) to ignite the power. As a result, MC went back to the past with her memories intact, probably because of her strong resentment towards the past.

Btw, there was indeed a transmigrator in this novel. It's Mia, the supposed heroine from the original otome game.

MC and ML only interacted with each other for a handful of times and all of them didn't last long. So for ML to suddenly propose to MC after that (and MC readily agreed), it's kind of sudden and rushed. Moreover, ML didn't have a good impression for the past MC (yes, they also met in the past) because she was histerical and far from the perfect noble lady image.

ML also didn't try hard enough to save the past MC from execution. He only adviced the king to re-investigate the case but that was it. As a related party, he should have a power to save MC (the king ought to give him a face, right?) but in the end, he didn't do it and rather chose to turn back time.

So the idea is that originally everyone took part in a plot against the villainess. This includes, the crown prince and fiance, his new lover (heroine of original game), the brother and the extra guy. Up to here, this is the usual set of suspects. In this story however, the king and queen, and the parents of the villainess and all the maids and staff in her house were also in on it. Literally, no one supported her. So why was there even a need for a plot ? They could have just killed her and no one would have cared, no one. No one !

Fine, so they make some plot so she is publically humiliated and executed for fun. What plot do they pick ? The most ridiculous self destructive one possible.

They actually poisoned the visting prince of the neighbouring stronger kingdom (probably stronger, hard to tell as so little is known of the world), unsurprisingly leading to a war with that kingdom in which they lost... Presumably, even in the original story all of the above had a horrible fate. This is the actual original plot. This is so dumb, I'm amazed.

Other annoying stuff in the novel. There are lots of stuff like:

Somehow the heroine has spent so much moeny in less than a year, as to have expanded a three year budget for the royal family and all the money of Duchy without anyone noticing. I just... What?

All the charcters following the heroine against the villainess are just silly and oblivious. Their behaviour makes no sense and is unrealistic. To the point one has to assume they are under a spell, but this means they aren't at fault... What do you want brainwashed people to do ? So this whole plot is weird because except for one or two people that seem intrinsicly malicious all the rest are also victims, yet they get the same horrible end, which includes torture.