I was born and raised in the area, and I would recommend she make a small detour to Laplace Louisiana to Jacobs http://www.cajunsausage.com/
The andouille is used by many restaurants. Nothing else will substitute. If your friend is going to go into a local supermarket in the NOLA area, I would recommend Dorignacs a local supermarket chain. http://www.dorignacs.com/
Walk the aisles and there are countless items that are local to the region. Also, don't forget to grab a jar of olive salad.