To not notice by anyone? ¯_ಠ_ಠ_/¯
She's 18. Also I know folks are going to point out her being a sick patient and all in her past, but it isn't as if she didn't mature or was stunted. She still grew and learn and aged. Altho she may still be naive. She did grow up in a hospital
Is running away knowing it can be dangerous an act to be not known by anyone???
True... that is a lack of common sense there... however as an adult, I hate being followed around or with a group. I'm more of a lone explorer and shopper. I rather be alone. But yeah, she wrong
cause isekai authors tend to do that with their characters
I wished that stories like these at least mention something about how being in a child's body (aka with a child's mind instead of an adult brain, bc even though they may have the memories and stuff that came along with growing up and becoming an adult, the structure of the two brains are VERY different and came affect ones actions/reactions/judgment/etc. tremendously. Hell, even a teenager's brain is different from an adult's and its part of the reason why they make bad decisions sometimes, as that part of their brain that deals with judgement isn't fully formed (I believe scientifically the brain is thought to fully mature for the most part around when people are in their mid-20's roughly on average, but really depends on the person as it can differ greatly). So, a character may of lived in another world where they were an adult, with the memories and all that comes with it, and had ended up somehow coming to a new one where they're now within a child's body, that's just it, they are in a child's body, and they shouldn't only be affected by that body (i.e. not being as strong, shorter, not as much stamina, etc.), but also the brain as well, bc it as much of the child's body as the rest of it. I think another thing that can put some of this into perceptive might be to look up stories of different children in real life who claimed to have reincarnated and see how well some might be more mature for their ages, they still act like children (whether these stories are actually true ot not is up for you to decide).
But all of this doesn't mean much when the author doesn't actually address this or make up some other reason why the MC ends acting more like an actual child, than an adult that were previously, especially when the character's behavior/actions tend to not be consistent. Plus I feel like the character should notice somewhere down the line that the way they have been acting/thinking isn't normal for them as well.
I think there is one manhwa where the character realizes this (but I don't think it was brought up after that point), I can't remember what is was though.
Honestly, I'm surprised that a child's brain (or even an adult's) would be able to process all those memories being thrown at it all at once and doesn't force some or a lot of memories to be repressed/shoved down (or even forgotten entirely) until the character is starts to gradually grow up and become useful.
And this is only what I know from my own experience and research into the subject (i.e. I'm not a professional basically), but wouldn't it make sense for the isekai-ed victim to experience one or more Dissociative Disorders? As it is A LOT of information to be processed (whether the character started as a baby (which is another subject bc I know story magic but a baby's brain couldn't handle ANY OF THIS AMOUNT OF INFORMATION AND ISN'T SCIENTIFIC AT ALL AND JUST AAGHHJKSLSKSD SKWKKS), thrown into the story at some random point, or they had grown up in that world and remembered (also, why is that a lot of characters suddenly fully hop on to "I'm now almost, if not entirely, the person of my memories and I am them now, and I am separated emotionally from this whole entire world that I 'believe' to be part of some sorta story" train, like shouldn't they be more of the person that they currently are over the person they remember? Like shouldn't they question things more and be a little apprehensive of accepting this "memory"? All the while just having an existential crisis about who they really are as a person, if this memory means that everything/everyone around them isn't really real, if she happened to make this up, and whether or not they may be crazy or something? If all of this is actually a dream from her previous life and if she wakes up she would go back or if it's a dream of her current life? If this means anything really matters? And I realized that I went on a mini-rant..... Let's just say that this comes from a person who for the first several years of their life was constantly having an existential crisis, as they believed the world and everyone/everything in it, including themselves, wasn't real and was just one giant pop-up book a mom would read to her son ) one day, or etc.) and I imagine that it's too much for anyone to take in all at once. Then add in the fact that most of the time they ended up their after dying and death is very traumatic event to happen to someone (also, why don't more of them have PTSD bc of this???). There's also the trauma of being separated from EVERYTHING you had known and the grief that comes with that, including the characters who had loving families and/or friends and/or just lives that they loved/were comfortable in, like that should be a punch in gut as soon as the character realizes it and it can take awhile for some to really understand what's happening and then for them to have this thought. There's denial, grief, anger, sadness, and just so freaking much right here that it'll break a person, which is where Dissociative Disorders step in, they're many people will/have experienced in their life (in some form or another) as it just makes you feel detracted from your emotions and even yourself, sometimes it'll even block out memories of different events (more so the more traumatic ones, as your brain wants to protect itself). So, I don't get why more don't just go into a form of shock and perhaps a Dissociative state right after all of this happens while their brains tries to catch up with everything and it all just seems extremely traumatic (even more so when the character is younger, as their brain isn't the same as an adult's and this something that would be hard for an adult to handle as well (though I imagine a child might bounce back better in the long haul due to their brains growing at a rapid rate as they grow, making them adapt better, but intentionally I feel like the effect would be harder on them).
For stories where the MC genuinely grieves for their family and past life is "I Was Just An Ordinary Lady", and I believe manga as well where the MC grieves when she gets to the othee world and just grieves so much when she realizes that she won't see her family again (unfortunately I never got around to reading it so I can't recall the name, I think she may of had the main goal of finding a way back home, but I'm not sure tbh).
She acts like a kid. Isn't she supposed to be older? Why is she so childish???