User blog comment:MoiraV/Case 41/@comment-198.144.116.115-20130920053614/@comment-12176464-20130920123007

She killed her (and previous characters too through other people) because she was working on her thesis which was about the fact that a murderer sleeps in everybody, you just need somebody or some event to fall for that killing urge. Madison was her "final work" as she says, seems like she didn't even have anything against her, she just needed to kill somebody relevant so to become somewhat famous.