Jonggowisastro (18) won the girls singles, girls doubles and mixed doubles titles.
Competing for North Harbour, she was also the top player in the team that won the inter-association final.
Jonggowisastro dropped just one game, in a quarterfinal match, over the course of the tournament.
Jonggowisastro has taken a year off international badminton as she is studying at the University of Otago with the aim of gaining entry into dentistry.
This was just the second tournament she had played all year, after winning the North Harbour Open.
Jonggowisastro dominated Waikato's Amanda Brown in the final of the girls singles, winning 21-12, 21-8 and showing world-class shot selection and execution.
She teamed with Mary O'Connor (Waitakere) to beat Madeleine Stapleton (Waikato) and Melissa Yin (North Harbour) 21-10, 21-17 in the doubles final.
Jonggowisastro and Evan Lee (North Harbour) beat Luke Charlesworth (Waitakere) and O'Connor in the mixed doubles final.
Charlesworth (17) won the boys singles title, emulating his father, Dave, who claimed the title 36 years ago.
He then combined with Brock Matheson (North Harbour) to beat Auckland's Dhanny and Riga Oud 21-14, 13-21, 21-11 in the doubles final.
