What does she mean that everything was going well before the academy... First of all, there was no epidemic, the only place that was hit by that was where it started but it was contained and almost no one died of it. Unless she lived in that area, no one pretty much knew that there was an epidemic at all.
Also, given that the marquis is a high ranking official, a death in their family should possibly circulate in the news, but there wasnt anything like that.
Even if she knew the bg story of the Game MC, there are still some info that should not have matched.
Right then, she should have seen the inconsistency.
So what was she talking about that everything was going smoothly. Was she ok with people dying of the epidemic just to get her harem ending.. wtf.. (i wont be suprise if she did)