Um.. I don't mean to pick on your mother, but since she's the one with dietary strictures, how about she makes you a grocery list and you just buy her the food to cook for herself? I'm vegetarian, so I know what a nuisance it can be, which is why I will sometimes nip off to a grocery store and pick up meatless provisions if I'm visiting omnivores. Unless your mom's an invalid or otherwise impaired, her nutrition is her responsibility.