I'm going to sabotage an old classmate's chances of getting hired at my workplace
That's awful. Why do you want to do that?
I want to show her what the price of being a skank is.
Holding a grudge against a previous classmate is very immature. People change, and they probably have. Acting this way will just make you look bad whether it hurts their chance for employment or not.
Whatever, it's good entertainment.
It would make you look like a jerk in front of the company. They would most likely fire you and replace you with her then you will really be upset.