In my perspective, Cassie should not have got revenge. I think your essay is perfect if I do say so myself. If you would lie to add more figuretive language, I suggest you give some thing that happened to you, and put it in there, make it even more interesting. It's your decision, but I personally think It's perfect.
I would go with default. Dictionary and library do not really make sense in this circumstance. Default suggests a pre-selected option chosen by the database, which makes the most sense in this situation.
