Can't she make a safe cupcake. I make 12 and freeze them, taking them out and decorating them as my dd needs. I send her one to birthdays parties, school parties etc.
She needs to look for vegan/gluten free recipes. Chia seed is a great egg substitute and there are lots if other safe alternatives.
I have a gluten/egg/dairy free kid in my room and he eats pretty much what other kids do safe options.
He loves flavoured tofu ( he calls it yogurt) and eats a lot of fruit/veggies. Quinoa is also a good option