12 year old girl has a crush on me, what can I do to not hurt her feelings?

Anonymous
I DON'T WANT ANY PEDOPHILE JOKES...I WILL MARK YOUR POST AS NONSENSE

Okay, here is some info, I have a Polish family that comes in here as customers and their adorable daughter has a major crush on me. She looks at me all smiles, blushes and then covers her mouth with her hand being all coy. Everyone knows she has the hots for me and her parents think its kinda cute and funny. So anyways, my girl (the one that I posted two questions about on here) comes in with my food and we hug and kiss, the 12 year old girl gets all pissed and starts crying, she won't admit why but everyone knows why. I want to tell her that she is just a kid, how the hell am I supposed to let her down without breaking her heart or being an ass about it?
12 year old girl has a crush on me, what can I do to not hurt her feelings?
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