Wests claimed the Ladies League Tag decider, outclassing Souths 14 points to eight.
The Lions scored first through Logan Flanagan, who took an intercept then raced 90 metres.
The Rosellas hit back as Nicole Stanfield teed up Rhianni Cipta.
Both sides then slotted penalties, as the score ended up at eight all at full time.
Wests would have the last laugh, hanging on in extra time to claim the title.
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