Could it be... could it be this world is supposed to be one from a BS novel or otome game, and MC was actually supposed to be a villainess or some BS like that the saintess (who got isekaied) decided "Let's cut the problems before they become one." or something like that. Then had MC's whole family destroyed so she could get her happy life because to her "MC (and her family) are scumbags and deserved a fate worth than death"...hummm...I'm probably just thinking too deeply and likely read too many manhwa/manga with this type of story.