why is this so quintessential of female authors?
It's not even a female target demographic thing — one can also find these extensive internal monologues, even with male characters, in male-demographic stuff written by female auctors.
For whatever reason they love their internal monologues.

Also: Siruka Bakaudon is the most female auctor on the planet:
>ultraviolent, guro-esque rape scenes
>psychotic internal monologues that go beyond anything I've ever seen
>extreme age gaps
>violent love triangles
>all females are portrayed as duplicit bastards

This is peak female author to an extreme