Victoria Shaw sounds exactly like Audrey Hepburn
Victoria Shaw sounds exactly like Audrey Hepburn in this movie. But she is Australian, and has no trace of an Australian accent.
Her voice must have been dubbed. Could it have been Audrey?
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Exactly like Audrey! I'm, watching it now-OMG.
"I told you a million times not to talk to me when I'm doing my lashes"!
Victoria Shaw does sound a tiny bit like Audrey Hepburn -- but by no means "exactly", or anywhere near it. I think if you really listen to the two one after the other you'll realize the alleged similarities are far more imaginary than real. Their accents, pronunciation and even vocal tones are entirely different, with only the vaguest similarities.
To the OP's rather fanciful question, no, Victoria Shaw was not dubbed by Audrey Hepburn or anyone else. She was Australian but had worked to lose her accent when she came to the United States.