I was there in February. I'm not vegetarian, so I didn't specifically notice whether there were meatless entrees (other than macaroni and cheese and the kids' pasta with marinara sauce), but there were definitely vegetable dishes.
There were several pasta dishes that were being cooked by chefs right behind the buffet table (particularly in the Asian section). I would imagine that if your wife asked they would stirfry a portion for her without the chicken or whatever meat the recipe usually includes.
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