"Portia Woodman is wonderful, she's a sprinter and we're always trying to catch up with her".
Theresa Fitzpatrick was the only other Black Ferns player to cross a couple of times, while Kendra Cocksedge kicked 13 conversions to go with her try.
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Harvey scored her first try of the game - and Canada's second - in the 81st minute.
There would be no let-up in the second half as New Zealand ran in a further 10 tries, with Woodman claiming half of the tally.
Woodman completed her hat-trick by the 20th minute and New Zealand went on to score another four tries by the break, with centre Theresa Fitzpatrick grabbing two as they went in 57-0 at the break.