The 25-year-old, the most consistent slider on the circuit this season, could only manage ninth fastest on her first run before bad weather meant the second run was cancelled.
Yarnold, who had a string of podium places this season including wins at Lake Placid and Igls, finished 152 points ahead of American Noelle Pikus-Pace.
The two are expected to be the favourites for gold in Sochi next month.
(Reporting by Martyn Herman. Editing by Patrick Johnston)
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