It's a bit weird in her case. Aria is more of a case of "forced to grow up" child rather than the memories aging her up. This was in the WN (I haven't read the LN), but the memories she got from the crazy chick were mostly just technical knowledge and none of the personality ones. Simply put...
Forgot if they included it in the manga, but the novel explicitly states that due to her developing mana at a young age, her body physically aged further than what her actual age is. I remember reading the WN years ago and every major arc has a passage that mentions something along the lines of...
This is the guy who will put his life together perfectly and will attract a bunch of mentally ill women in university but will stay faithful to his CH friend. This, of course, adds a +100% attractive modifier.
It's mentioned that having Sou is what enabled her wealthy financial status (its compared to winning the lottery). Basically she gets a rather nice Government support fund for raising a male in the household. It's also heavily implied that most men don't even work and are supported by Government...
It's possible that a sizable chunk of the female population could and does end up like this, which is why males need to be protected. There's also the point that Sou's bodyguards are specifically selected and trained and even they seem to have these tendencies in private but at the same time, it...
Do remember that just prior to Elrise un-apocalypticting the world, it was in every sense of the word fucked. Basically the only places even remotely safe was human cities and travel between cities was an extremely dangerous thing so people wouldn't be randomly exploring places and trade routes...
In this episode our murder hobo heroine gets even more murdery and even more homeless! But it seems a timely meeting with her past may start to change that!