Probably because the one that having development in the story are all the people that are near tia, same as the prequel mangaSeeing that everyone still sees bertia as cutie clumsy, just proves why her character didn't have any development..
Dont get me wrong, she was cute when before she married the prince, but to think alter all those years she still in her own chuuni mindset just irks me...
Lucky her that the plot (or more like the prince himself) just goes along with her
Yep that’s exactly the point in this manga and what makes it one of the greatest Isekai Villainess manga out there, she’s not your typical ‘i got isekai’d as the antagonist so i must try to change things up so i can survive & change the outcome of the novel’ heroine, Bertia is just a really nice,naive & oblivious girl who tries too hard to be a villainess. Having her grown out of all those things will only take out the specialness of this mangaProbably because the one that having development in the story are all the people that are near tia, same as the prequel manga
Tia doesn't change but she changes people around her