Hi - sorry to hear about your girl's allergies. The good news is the "mild" part - that's awesome! But it's still a big adjustment to make, so
to you. Like others have said, it honestly does get easier. Checking packet labels becomes second nature, and you'll soon know which brands of what are OK for you to buy, so the groceries won't always take 2 hours to do! Turning down the offer of foods that you just don't know about seems less and less unfair on your kid when you think about how they're not really missing out on any fun considering how they'd end up if they
did eat the food. The children adjust really well themselves, because it's how they grow up, not some dramatic big lifestyle change that they need to make.
Allergy NZ have some helpful resources and support. Also, something that really helped me is when my BIL's partner (anaphylaxis to nuts) told me that once the food labelling standards changed, she suddenly saw a whole lot of 'safe' foods of hers labeled "may contain traces of nuts" or "manufactured in a plant that also processes dairy, etc etc"... but these were foods she's safely eaten for years, without incident. Those warnings are more the company covering their behinds just in case something happens to someone, rather than a health warning, and it's up to the consumer what they want to make of them and whether or not they'd buy those foods.