Winning on her birthday “was a good present for her”, Callahan said.
“She's put a lot of work into training . . . she'll go a long way.”
Gisborne Trampoline Club members won 15 medals, including six golds, at the national competition.
James van Aswegen won gold in the 15-16yr men's synchro with Isileli Kamoto, as well as silver in the double mini and trampoline.
Van Aswegen had better form than his competitors but would need to raise the bar on his degree of difficulty if he wanted to make an impression in the highly competitive 17-and-over category next year.
Lily Arnold had a strong performance in the double mini-trampoline, earning gold as well as a bronze in the synchro.
She competed in the sub-junior international women's category, and Callahan said he had a lot of coaches come up to him after her performance on the double mini asking where she'd come from.
Arnold will graduate to the junior women's category next year.
Callahan said he was pleased with the results at the final competition of the year for the club. The athletes would now change the focus of their training to improve their skills, form and jump-height.