She's a traumatized highschooler. Or were you not paying attention? Her original personailty is not a strong one so why would you expect it to be better inna different world when she hasn't even resolved shit in her own world yet? Seriously learn some patience or occupy yourself with a different story and THEN come back to this one. Simple.
If it's plot where she can't change until she gets closure then there's your answer. Some people don't change immediately when the situation calls for it instead they struggle with it. Who knows maybe she'll change when she finds a love interest she's willing to change for. We gotta be patient like parents and see her grow.
Guys I’m on chapter 23 and I’m so annoyed by the mc that doesn’t do anything and only stares and keeps quiet all the time. Idk try to gather people at the picnic and shout that ur canceling the engagement talk to your brothers let EVERYONE know. I mean for her it should be life and death why is she so quiet. Pls tell me she gets smarter or better