You say what you said in your post. Thank you for your offer but This is MY daughter's first year in school and I want to buy her her first backpack and shoes.
You could always redirect "Ah thanks for that offer, we're good on those items but you know what would be helpful? Some packs of school shirts" or maybe "I've seen a lunchbox she loves but it's out of stock in our nearest store, if you see one that would be super appreciated"
Say “Thank you but she’s already set for school”
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Maybe just say you’ve already ordered some for her and just waiting for them to come x