You've got a few years to really talk up NC State, East Carolina, or one of the other in-state schools to her.
In all seriousness, it sucks that Carolina doesn't offer any legacy non-res tuition waivers. A lot of schools do, but most of those don't have P5 athletic programs that function as huge marketing tools for the school. My only advice is, whatever else happens, don't let your granddaughter take out student loans to pay for ridiculous non-resident tuition. We all love Carolina, but at the end of the day, it's just a state university that isn't objectively worth a $20,000+ per year premium over your in-state schools. If you or her parents can cover that premium without enduring hardship, great. But don't let her take on that much additional debt.