The competition's most resolute defence stunted the progress of the Mariners' livewire attack who were held scoreless for the first time this season at Polytec Stadium in Gosford.
The win puts Perth level on points with Central Coast at the top of the table with only goal difference keeping the Mariners in front.
Elsewhere, Newcastle picked up an unlikely point with a 1-1 draw with Melbourne City at ctrl:cyber Pitch, and Adelaide United played out a 1-1 draw with Melbourne Victory in a fiery showing of the original rivalry at Lakeside Stadium.
It was a Buchanan family derby as younger sister Ella's Glory side beat out Kaiya's Mariners.
American Emma Tovar was in dominant form patrolling Perth's midfield on Saturday, picking up an assist in a player of the match performance.
"It feels amazing to us girls to be level for first right now," the midfielder told Paramount Plus.
"We went into this week knowing that it was a top of the table clash, and that motivated us more to come out here and get the win.
"Nobody likes to travel all the way back to Perth on a loss ... and I'm happy to get my first assist of this season."
As the game threatened to finish as a scoreless stalemate after few genuine opportunities, Glory found the winner as Maggie Jenkins scored a thumping 78th minute header from Tovar's cross.
Earlier in the afternoon, Melbourne City struggled in their A-league return after landing back in Australia on Tuesday from a mammoth 48-hour journey home from Uzbekistan after three Asian Champions League fixtures.
The 1-1 draw on Saturday marks just the third time in history the Jets have taken points against Melbourne City, but Newcastle remain stuck to the bottom of the ladder with no wins this season.
'Vine time' got the home side going in the 43rd minute as the superstar striker executed a clever first-time dink, even while slipping, to chip Jets goalkeeper Anna Henninger.
The Jets found their equaliser in the second half with a scrappy goal from centre back Tash Prior.
Tamar Levin's free-kick was initially saved onto the crossbar by Malena Mieres but City couldn't clear and Prior's shot trickled into the bottom corner.
The home side dropped points for the first time this season and are sitting in fourth position despite missing games while in Asia.
Across town, Adelaide United capitalised on a penalty awarded in the first 90 seconds, cooly converted from the spot by Tessa Salvestrin after a Melbourne Victory handball in the box.
The home side found a controversial equaliser when they decided to play on despite an injured Isabella Yakel still lying on the ground, and replays showed a foul was missed as the Adelaide player appeared to receive a stomp on the ankle.
A lofted ball forward caused a mix-up between United defenders Tianna Harris and Emily Hodgson, and snuck through for Melbourne's Ella O'Grady who produced a true poacher's finish.
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