I'm sorry your family has had to learn to be so vigilant with food, too. My youngest has food allergies, too, but hers are to peanuts, fish, and sesame--ingredients that are less likely to be hiding in other foods (unlike dairy and eggs). We are hopeful she might grow out of it and we can return to eating at some of our favorite ethnic restaurants that use a lot of fish sauce, fish broth, sesame oil, and peanuts! I hope your daughter outgrows her allergies, too.
It is so stressful worrying about somehow letting an allergen slip through. Kudos to you and your wife for keeping your daughter safe and healthy!