Well she live in confinement since she was a child never got to go to school never got to hang out with people her own age and never got the chance to grow up so her being 18 does not have any relevance she acts like a kid because she still is one her mental age isn't technically the same as her physical one
Correct. And while it is shown a little, I do think it would be interesting to see more of how her past traumas effects her. But again, the plot is really slow and we're not that deep into the story yet so i think it's still too early to make any comments on it. I think the author will go more into it tho. But they might not go TOO into it, considering the tone. Fluff is importnant, afterall (。^‿‿^。)

MC IS an abuse victim.
But that doesn’t excuse atrocious writing. She suffers from poor character development and author seems to love flaunting her pikachu face all the time. Abuse victim? Why are you always giving full page spreads of her golden hair flowing and and her pikachu face taking up half the chapter. I want to know more about her trauma, not her constant wardrobe changes. Give me more insight into her past and her struggles, not the COMMENT SECTION filling in the plot for me when you’re not doing it and instead trying to show us how cute she is. Sorry guys I’m out.