It is another valuable lesson for her as she eyes both C1 and K1 at the Tokyo Olympics and she has another chance of improving in tonight's K1 semifinals.
"Having already paddled the course twice is an advantage for sure and I'm looking forward to the K1, as paddling it with two blades will be easier in a lot of places."
Fox brought up her third consecutive C1 World Cup title of 2017 in stunning fashion, posting a time of 100.83 to finish well ahead of Wolffhardt on 111.57, with Czech Tereza Fiserova third.
Czech Vit Prindis also added his third title of the year, winning the K1 men's final, with his 87.15 time just enough to edge out Michal Smolen (United States) on 87.44. Both paddlers competed in New Zealand last summer at the inaugural Whitewater XL.
Tauranga's Mike Dawson had a few issues in his semifinal, finishing 33rd, as a number of top paddlers failed to fire on the tough Ivrea course.
Dawson will also have another chance at redemption, lining up in the extreme slalom heats alongside fellow Kiwi Finn Butcher, with Dawson having won a gold and bronze in his two World Cup outings in that discipline so far this season.