Is this correct?

She passed on three years ago,

meaning (passed away)

I think I've head them using it in movies..

Thanks in advance!
Many people just cannot bring themselves to say "die". Another expression is 'pass over'.
Yeah, I feel the same way, Clive.

But for some reason, "Her passing" seems okay, while "She passed" is a bit odd.
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Yes, passed on can mean passed away.
 Philip's reply was promoted to an answer.

I've started hearing people say simply

She passed three years ago

which seems a bit cringe-worthy.

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 BarbaraPA's reply was promoted to an answer.