The Sunday feature of the April Season Opener at Thunderbird Show Park also saw U25 winner Georgia Knight grab second with Ero Del Pierire.
The Canadian and "Romeo" bested a three-horse jump-off to win their third U25 competition of the week at Thunderbird Show Park.
The 16-year-old made the top six in the final "jump off" phase where she received the highest marks to eke out a victory.
For her stallion Clockwise of Greenhill Z it was business as usual despite a tack malfunction in the CSI3* Grand Prix.
Kyle King and 'Odie' won the Wednesday opener and Jim Ifko topped the leaderboard on Thursday with 'Monty' over Joey Rycroft's courses.
Matt Sampson shines in the CSI3* ATCO Cup Grand Prix; Tiffany Foster continues her winning ways at Thunderbird Show Park.
Fresh from Europe, Sampson takes the Challenge with Curraghgraigue Obos Flight; Chernoff is MarBill Hill U25 champion and Betker bests Derby.
The Canadian racked up three big wins during the Summer Fort Welcome; more than $34,000 raised for Uryadi’s Village in Ethiopia.
Highlights from Thursday's 1.40m Challenge, MarBill Hill U25 and Canadian Hunter Derby at Thunderbird Show Park.
The Canadian rode the speedy 17-year-old to edge Robert Blanchette (IRL); her operation is now based down the road in Langley at a new farm.