Vanity? Certainly you misunderstood her actions, she merely wants the beautification of all things for the sake of ponykind! She will be at the front of a new renaissance, ready yourself friend, a fabulous Equestria is on the rise!
I get the joke and all... but it's a stupid idea for 2 reasons 1. The RPG rockets needs some airtime to arm itself, it wouldn't work at ,0 range. And 2. the most obvious reason ... itf it somehow did work she will be caught in a blast.