The Canadian, aboard Christiano who “likes to go fast”, claimed victory in the $5,000 FEI 1.45m Two-Phase in a field of 47.
Nine teams took part in the $150,000 event at Wellington International, with Canada finishing just off the podium behind US, Ireland and Belgium.
The Saturday night feature at the Royal Horse Show in Toronto saw Millar earn her second Championship title, this time aboard Jelvinia MB.
Germany sets the standard with three clears; team members will all be eligible to compete in the individual qualifier on Monday.
Conor Swail takes ATCO Queen Elizabeth II Cup with Amy Millar 2nd; Manuel Gonzalez delivers only clear round in tough Sun Life Derby.
Amy Millar, Mario Deslauriers and Erynn Ballard will represent the maple leaf in Paris; Tiffany Foster named as travelling alternate.
Amy Millar believes it's possible: "I think we’ve got the riders to win" she says following her win with Christiano at Spruce Meadows.
The all-female show jumping squad of Tiffany Foster, Erynn Ballard, Beth Underhill and Amy Millar took on 10 teams in the $150,000 event.
The same all-female squad who represented Canada at the 2022 World Championships in Herning will compete on Saturday, March 2nd.
Canadians dominated the podium as Tiffany Foster placed third with Com Es Ta in a large field of 55 starters.