The New Zealander now has six World Cup victories, the first earned at just 17, and she was one of eight athletes announced to represent New Zealand at the Winter Olympics in Italy early next year.
The win leaves Robinson on top of the discipline standings with 232 points and she will have a chance to extend her lead with a second giant slalom on the same course tomorrow morning. Austria’s Julia Scheib is second on 180 points.
Elsewhere, US star Mikaela Shiffrin, who finished third after the opening run, eventually finished sixth, 1.65s off the pace. Shiffrin appeared to be dealing with back pain at the finish.
Though undefeated in slalom this season, Shiffrin is still searching for her best giant slalom form as she continues rebuilding after an abdominal injury.
Swedish Olympic champion Sara Hector meanwhile crashed out in the opening run.
In the overall World Cup standings, Shiffrin remains in front, holding a 122-point lead over Albania’s Lara Colturi, who placed 23rd this morning.
The season’s speed races have yet to begin; the first are scheduled for next week in St Moritz, Switzerland.