How to Kill the Why game with toddlers?

I have a 3 year old niece, and she's not that curious. But whenever I babysit her she asks if I'll 'stay there for the ever' and when I say I can't, she goes 'WHHHHY???' And no matter what answer I give, she goes 'WHHHHHY?' How do I kill the why game? What can I say? show more I have a 3 year old niece, and she's not that
curious. But whenever I babysit her she asks if I'll 'stay there for the ever' and when I say I can't, she goes 'WHHHHY???'

And no matter what answer I give, she goes 'WHHHHHY?'

How do I kill the why game? What can I say?
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