Thank you all for your helpful advice. I would definitely not consider taking on a child with a nut allergy, that's for sure. I emailed the Mom back and said I can do vegan snacks (since we focus a lot on fruits and veggies anyway), but she would have to pack a lunch. I also serve hummus quite often, which should be okay. We'll see what she says. I looked at my lunch menu and realized that there isn't a single day that doesn't include meat, cheese, or eggs, so that's why I told her she would need to pack a lunch.