I think this situation falls pretty squarely into "two wrongs don't make a right" territory. The moral intuition is that a minor social infraction doesn't justify a violent response, even extremely minor violence. Even though you don't say so, perhaps that was a tacit reason for you to acknowledge it as a mistake.

I do sympathize with your frustration at encountering such naked privilege and entitlement on her part, and that you would want some sort of recourse. It's possible that such brattiness would cause her trouble in her future relationships with men, but that isn't even necessarily true. You can't really get recourse for behavior like this; you just have to shut it down when it appears. I think you've learned that lesson.