Is it flirting if your crush asks you for a piggyback?

My crush recently keeps asking me for a piggyback and is not even joking about it (I say okay after saying no a few times believing her to be joking which I was proven wrong).
Not quite sure if she likes me or not but we hang out a lot but sadly she calls me her 'cousin' or 'bestie' or 'babes' I don't know what to do now.
Is it flirting if your crush asks you for a piggyback?
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