@kleiner
It's true that possibility of culprit being a woman is probably lower, but you assumed it's impossible, and I agree it's sexist.
Basically you say that only men are capable of molestation and rape, while woman are by default innocent in such cases, or what?
There are sadistic woman, and woman who prefer girls. The difference is, woman are normally more rational and cautious, and it's much harder to prove that woman raped someone, normally police wouldn't even believe you if you tell them something like that.
That's why the molester in this chapter might as well be a woman, who is too cautious to actually do anything, despite her dark desires. She may know that if she does it and gets caught, she will get in trouble, and it's not worth it. But if there was no punishment for such actions, she would probably do it.
TL;DR The "offender" can be a woman, nothing prevents this from happening, based on the information we have at the moment. The fact that you think it's impossible shows that stereotypes are strong in you. It's not always a bad thing, since stereotypes are often correct, but the fact it's sexist remains true.