What I remember is that MC transmigrated into a world where she knows that family is some sort of villains so she poisoned them and blamed the merchants for their deaths. When her fam died she became the lord of their place and had to participate in wars or smthing. I remember her first war to be so sad cuz her butler(?) died and she learned that his family were the merchants she blamed. I think shes at an otome game world not sure tho...
It's a JP one if I recall correctly https://www.novelupdates.com/series...-villainess-but-why-did-it-turn-out-this-way/ WN version https://www.novelupdates.com/series...llainess-but-why-did-it-turn-out-this-way-ln/