I see this attitude all the time by this generation. They think they are teflon coated and immortal, they think they are entitled to everything right now, and they aren't afraid to be confrontational and mean to get it. They are bullies. She's no different than what I see every day from neighbors, on the commuter train, and around town.
Having said that, yes, she should be accountable for it. Someone has to show her and any others like her, that there is accountability for your actions. I call it karma, you call it what you will.
Ada