Whatever Became of the Squishies by Claire Chilton
She's just inherited super powers of... er, sarcasm? She's wild, outspoken, trouble follows Carla Mainston wherever she goes. But what do you expect from a purple outcast living in a green colony? She's the last girl on the planet who should be inheriting special powers. As if that wasn't bad enough, there's a deadly disease spreading faster than a dirty joke in the playground and when Carla's brother Joe becomes infected, she has to find a cure before it's too late. With the assistance of a muscle-bound scientist called Parklon and a dealer in illegal books called Bob, Carla discovers that superpowers don't come without a price. With a murderer on her heels, Carla has to use every trick in the book. That's if she doesn't get arrested, or end up having the life sucked out of her by her new boyfriend.