The British rider and her marvellous horse brought down the house, scoring a personal best 88.330% in the Freestyle to nail down the title.
The British rider and her Olympic partner topped the Grand Prix with a score of 76.761%; all 16 entries qualify for Saturday's Freestyle.
Edged for the win by a whisker in the CDI3* Grand Prix Freestyle, Canadian Camile Carier Bergeron and Finnländerin were a close second.
Tinne Vilhelmson Silfvén (SWE) took the Lövsta Future Challenge Developing Grand Prix Horse Final aboard So Perfect.
The Canadian rider also won the CDI1* Prix St. Georges on MSJ Valentina Roma; competition continues through Saturday.
The Development Program recognizes the top-performing four-, five-, six-, and seven-year-old division young dressage horses across Canada.
Outstanding performance horses, stallions, mares and their breeders were recognized at the association's recent AGM.
Key discussions at the Pan American Equestrian Confederation included education, coaching, rules, para-equestrian, horse well-being and clean sport.
All eyes will be on Fort Worth as 18 horse-and-rider pairs from 15 countries ‒ including Canada ‒ will battle it out in Dickies Arena.
After five qualifiers throughout AGDF, the Canadian took the champion’s sash riding Jill Irving’s nine-year-old gelding.