Has an Olympic Hockey (Women) game ever ended 16-0?
Exactly once. On February 11, 2006, Canada beat Italy 16-0, and no Olympic Hockey (Women) game before or since has ended that way. When it happened it was a scorigami, the first 16-0 in league history.
That makes 16-0 the 27th most common final score out of 41 that have ever occurred in Olympic Hockey (Women). One point away, 17-0 has happened never and 16-1 has happened never.