This girl is too stupid for this power. She's leaving too many possible ways of being caught, and she toys with them. Rule#1 with killing someone, you don't toy or fuck around. She's also not thinking about when she should use her powers. Except for the knife wielding thug that was killed, the two shitty high school bitches she killed could have been killed with a much more sneaker approach without anyone ever seeing nor noticing. For instance, she just needed to wait until the red haired bitch went to use the restroom, and she could easily transport inside the restroom, drop her off in the ocean, and teleport back. If she was more careful, there wouldn't be traces that can be led back to her. But then of course, if she was smart enough, there wouldn't be much of a story to tell and no real conflict. So it all has to happen conveniently for the sake of the plot.