IANAL, but she isn't just a thief.
Taking the sign constitutes an assault by bodily force.
When asked if she has ID, she first says no.
When asked again, she confesses that yes, she does have ID. That's making a false statement to a police officer during an investigation.
And she could probably be charged with damaging the sign, which was in fact damage to private property.
But the look on her unprepossessing face when she realizes that laws are real, and she's about to get her criminal ass hooked and booked, is priceless.
So the next question is what the university's policy is on students who are multi-offence violent criminals, committing crimes on university property, and what the taxpayers of the state of NC have to say about letting such violent criminals continue to attend a public institution where she might offend again, against their precious sons and daughters.
I would suggest a class-action lawsuit against her, her parents, and UNC officials should be pursued with vigor, by all potentially affected parties, if she's not expelled. That would include speakers on the campus and vendors thereto, as potential crime victims as well.
Then there's the federal case for deprivation of civil rights, by someone almost certainly receiving federal funds at the time.
That has to be about ten federal crimes, and none of them likely to be misdemeanors.
Snowflakette is about to become an awfully popular person.
Maybe she can do her future scholastic efforts online, after she finishes her community service and probation, and after getting her ass kicked out of UNC for what must also be black-letter law violations of the official campus code of conduct for students and faculty at an official state-run public university. She can probably be banned for life from all campuses.
Best wishes getting a job anywhere (except NOW or NARAL) with no degree, and a criminal record, Cupcake.
That education is going to be the best one you ever got.
MOAR of this, please.