K.B.
My son has the same allergies. Have you talked to her mother to find out what she normally eats and drinks?
She's not allergic to everything...just the things you choose to mostly eat. :>)
Pastas, sandwiches where you can each choose your own toppings, canned fruit is cooked and works for my son (and convenient). I'm assuming you wouldn't force her to eat vegetarian or skip the milk and cheese while she's at your house. Though I think if her nut allegy is life-threatening, as most nut allergies are, you should consider limiting or eliminating them from your cooking while she's there, or at least the ones she's most allergic.