wheat is a grain. not a nut
but I would not feed someone with allergies anything from a mix- or anything that processed. you have no idea if the factory where it was package/processed has been contaminated with any types of nuts etc.
does your friend know you're baking from a box mix (for her allergic child)?
I'd let her know about it, if not, just to be safe.
ACherrybrook Kitchen makes allergy-friendly mixes if you don't want to bake from scratch. You should be able to find them at Whole Foods.
http://www.cherrybrookkitchen.com/products/cakescookiesbrownies.php
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