The US rider rode Miss Lulu Herself to take the 40th edition of the horse trials in New York, which attracted more than 350 entries in 21 divisions.
Colleen Loach
The US rider had led after dressage, but slipped to 4th after cross-country before bouncing back; Canadians won the 4*-S and the 2*-L.
Only eight of 21 riders made it around the 5* cross-country course, while Sharon White and Jaguars Duende clinch top spot in the CCI3*-L.
The US rider led from start to finish to capture the $40,000 CCI4*-S; top Canadian was Colleen Loach with FE Golden Eye in 5th.
All Canadian horses pass the initial inspection at the Paris Olympics; eventing dressage starts July 27th at the Versailles venue.
Top Canadians in the $100,000 event were Waylon Roberts and OKE Ruby R (12th) and Colleen Loach riding Vermont (13th).
The Canadians advanced from third to first to win their first team gold since 1991; Lindsay Traisnel grabs the bronze medal.
All four team members are in the top 8 individually following solid performances in the dressage phase; cross-country tomorrow.
Canada's Colleen Loach and FE Golden Eye place third; most of the field withdraws before cross-country as Ophelia brings torrential downpours
The US rider wins the CCI4* with Tsetserleg and also places 3rd and 5th; Canadian Colleen Loach and FE Golden Eye place 2nd.