Morris rode Quejanaisabella to scores of 224, 214.5 and 220 for the show championship.
Rieta Dufurrena, who brought an unbeatable lead into the World Finals, won the 2012 Senior Youth World Championship.
Bred by Greg Coalson, 7-year-old Quejanaisabella is by Quejanaisalena out of Nip And Play, and has earned over $23,000. The mare is owned by John McClaren and trained by Amanda’s father, Craig Morris, who was a Super Stakes Classic finalist with her last year.