I think it might be more fun and more sneaky to have it build up slowly over the course of a month or two? Like actually make it questionable at first to what's going on--I'm sure Terezi will assume it's her, anyway--but at least for the rest of the cast/game.

I figure that if she does actually KILL anyone the legal system would have to get involved, yeah :|a

And depending on how things go/who tries to stop her/who she kills/maims, she may brag about it. AGAIN IT DEPENDS ON SPECIFICS...