T.W.
The entire class cannot bring anything with peanuts because of one little kid? Wow! That is an allergy that takes over huh? Have you considered another class or asking the parent of this child what she prepares? I have never heard of the whole class having to be affected by one allergy this way.
Needless to say, sorry about the rant, there are a ton of things you can do for lunches. My kids always love the veggies with a dip, deli sandwiches, any fruit or fruit cup, baked chips, and those little pudding cups for a treat. I don't think any of those have peanut content in them.
Good luck!