A late run of five consecutive goals helped the visitors secure the victory.
The Mainlanders move atop the competition table in the second weekend.
The Wellington team were eliminated from the 2023 playoffs by their northern rivals.
The Mystics produced a dominant second half.
The move would effectively spell the end of the ANZ Premiership.
Ameliaranne Ekanasio says there's still a clear gap between New Zealand and Australia.
Currently Kiwi netballers who play across the Tasman are ineligible for the Silver Ferns.
The 2019 World Cup winner has only extended for another two years, but wants to be at the helm for the next tournament.
Dame Noeline guided the NZ women to the world crown in 2019 - but also their worst finish four years later.