Start charging her late fees from the minute your clock strikes 6 until she leaves and as far as snacks to go....just say no.

OR you could do what I'd probably do and send a note home, saying you close at 6 on the dot which means, they need to be gone by 6; then mention the late fee even if they're chatting at 6:05, let them know how much of a fee it'd be. And mention in the note, no more snacks are allowed at pick-up; if their child cannot wait then it's the parents' responsibility to provide them.
THEN if they still take advantage, charge them the fees and also refuse to provide more snacks. Because they have been warned!!

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