Well, i really don't know what she did if anything to make a difference...
BTW there are stats posted on this year's class enlightening on another thread here's the link you can check your stats against these to get an idea. UNC News - Preliminary Profile: 2012 UNC-Chapel Hill First-Year Class
First, she applied early action. Although she was deferred, this may have helped her. After she received the wait list notice, she sent in the 'accept the spot' notice right away, that may also have helped. We talked about it and she said that she was confident that if she were offered a spot she would walk away from the school she had already committed to. It's important to remember that the wait list thing is really hard on the kids.. They have already painted uptheir cars with their new schools and the graduation programs are printed and stuff, so they're backing out, it's not easy.
Anyways once she told me she was sure, we decided it wouldn't hurt to communicate that to the school so she called there. I have no idea if that had an impact. they told her there would be no benefit but i know it was a tiny percent of wait list kids who got in.
My D is Hispanic, OOS, 3.8/4 unweighted ACT 31. Volleyball State Champion 3 times as a starter, coach's award etc. All AP and honors.
I WILL say that my understanding is the reason most OOS kids are waitlisted is because the school believes they are qualified to attend but for some reason they haven't really established the kid had a strong interest so may not accept the spot... they want to offer spots to kids who will accept. So one mistake we made was to NOT visit. well, we visited but we didn't check in with admissions that was STUPID.
IF you can visit, it can't hurt. Make sure you check in with admissions. Actually it's a good trip because Wake Forest, Elon, NC State, and Duke are all within an hours drive and they're all great schools.