I mean chile, as lmuch as I love the series for the tea facts, it's just not realistic. One does not overturn a social norm that could lead to people literally looking down at you because corset is like underwear back then.. imagine if you didn't have underwear now and people could see it.
The only reason wearing corset now is a taboo was because SOME emphasis on SOME brand of corsets caused really fucking scary diseases however some are actually safe to wear and can actually help you (medical corsets are worn by scoliosis patient to get their spines on the right shape and some corsets actually provides comfort in mind like the working women brand of corsets)
i actually really enjoy her character, i think she's one of the more realistic characters in the whole isekai category. she's not some business woman who can flip the entire nobility with some fucking tea here and there (yes i'm throwing shade at That Manhwa), she just wants to do her best for her daughters and she prioritizes them above all else. it's not as extravagant of a plot as i would have liked, but it's quite pleasant to read from an actual regular person's point of view.