Harris became the first player to hit a double ton in the Katherine Raymont Shield, with her landmark knock for Wests against Sandgate-Redcliffe continuing a brilliant run of form against the Gators that has seen her score two centuries and a double century in the past four games.
Her 200 also eclipsed a 20-year old record in Women's First Grade set by former Australian player Kim Fazackerley (172*) whilst playing for Beenleigh/Logan in 1998/99.
Harris scored 200 of Wests total of 291, with her milestone coming off 152 balls, including 26 fours and five booming sixes.
It was a weekend for the batters, with Fire, Heat and Australian allrounder Delissa Kimmince leading the charge for the Gold Coast with a stirring 101 not out from just 72 balls to help the Dolphins to victory against Valley.
Young Valley batter Charli Knott top-scored for the home side with a patient 76.
There were also notable efforts from Dutch international Sterre Kalis, who top-scored with 91 for Ipswich/Logan and Fire and Heat allrounder Haidee Birkett who did likewise for University of Queensland in their narrow win over the Hornets.