Could be a troll, maybe she's just attention-whoring but even if it is a troll, things like this happen more than the average bloke would expect.
This happens for almost every decent looking mass murderer that was prominent in the media. Eric & Dylan, Nikolas Cruz, Bundy, Dahmer, Ramirez, Manson etc. all have their groupies and worshipers. It's a morbid curiosity combined with being edgy/going against the status quo thing and the ever-present lookism plays an important tole in it.