Grits are available at the CBR food court. Just use a snack credit or pay cash!
1900 Park Fare lists grits on the buffet menu. I'd verify with the DINE line when you make an ADR.
Boma has Pap "white corn meal" that is probably close to grits. That buffet gets high praise on these boards. We only had dinner there and would give that meal high praise. It will be a must do on our next visit.
Hope those work for her!