You are failing to recognize & appreciate the overarching PWHL narrative: No women's ice hockey existed before the Professional Women's Hockey League.
But if you choose to compare attendance figures for the collective of "women's hockey" in the United States (pro & amateur), there has been an NCAA Division I women's game that exceeded the headcount of the U.S.-Canada Rivalry Series matchup in Seattle: Jan. 14, 2017, St. Cloud State University Huskies @ University of Wisconsin Badgers, Att. = 15,359.