The weekend competition marked her first appearance since serving a one-year suspension imposed by the FEI.
The ban stemmed from a horse whipping controversy that emerged last summer. After video emerged of her striking her horse repeatedly, Dujardin accepted she had made an "error of judgement".
Dujardin, who was provisionally suspended from 23 July 2024, won two categories at the event on her new horse, Special Effect.
She is now permitted to compete in domestic events without seeking permission from the British Equestrian Federation, but would require it for international competitions.