Is she strictly vegan? Either one is certainly doable, but veggie is much easier and she can order off the regular menu (almost all restaurants have at least one entree). Ohana at the Poly is great at accommodating vegetarians/vegans, and all of the restaurants at AKL are veggie friendly. If you are looking to stay in the parks...My favorite meal at Epcot is the grilled veggie stuffed pasta at Akershus (although I imagine there is probably cheese in it?), and TH and CP buffets are pretty veggie friendly. If she does not eat any dairy, I would call the restaurant a few days before your trip to give them a heads up.