"I was the only Trojan swimmer at the Auckland meeting because the rest of the members stayed here for a Hawke's Bay meeting," she said.
Van Zyl also claimed two bronze medals in the 100m butterfly and 50m freestyle races.
She met Olympian Lauren Boyle as well as Paralympians Sophie Pascoe and Mary Fisher.
The parent swimming body, HBPB, only recently accepted the registration of the Trojan club. Before that the members swam for Raumati Swim Club in Wellington thanks to Trojan coach Daniel Bell's connections with his Wellington club counterpart.
Trojan members swam for Raumati for the last time last month.
Van Zyl was part of the Raumati medley relay team who broke the Wellington girls' 13 record.
"I swam the third leg, which is the butterfly in the 25m pool."
She also collected a silver medal with the freestyle relay team and a gold with the flying squadron (10-person) team.
Raumati last won the flying squadron relay title in 1988.
"It was quite a nice way to say thank you to Raumati," says van Zyl.