My DD is GF vegetarian but used to be vegan. Restaurants can change vendors, so what may be GFVs safe now could change. You have to ask, every single time.
Sanaa is very good and they have a dedicated GF menu. Sci Fi can make shakes from soy or rice cream, and there she typically gets a veg GF pasta dish made. Satuli Canteen has tofu bowls but not all the sauces are safe, again, always ask. Frontera was really good. Many other table service restaurants can make GFV meals. We don't typically eat at buffets, but a chef will show you what is safe and make you fresh items in the back and bring them to you so no cross contamination. Trail's End's Chef TJ is awesome at this!