I know that if you go to Boma and make a request, the chef will come out and speak w/ you about your needs and I've heard that they do an amazing special dish (not sure if it's for vegetarians or those w/ allergies but we saw it on our trip in September).
I'm pretty sure that most of the restaurant chefs can make her something if she's not happy with the options.
Does she eat fish or is she vegan?