The Stingrays narrowly missed out on a finals berth, falling just behind fourth-placed Kensington on the table by percentage.
Eagles allrounder Tahlia McGrath had another solid day with bat and ball, collecting 37 runs and 2/11 for Torrens.
McGrath was supported by Ellie Falconer (26) and 16-year-old Paris Hall (38), the Eagles being bowled out for a competitive total of 169.
Stingrays captain Jess O’Reilly (3/7) and Amy Peterson (3/10) both contributed with three wickets each.
Falconer's (5/23) career-best bowling figures ensured that the Southern District batters never got going and the Stingrays were dismissed for just 90.
Northern Districts bowlers Sam Betts (5/9) and Darcie Brown (4/19) defended their side's poor batting display and dismantled the Kensington lineup for just 60 runs.
For the second consecutive match, the Jets struggled badly with the bat, but amazingly, their miserly 76 was enough.
Bridget Patterson (25) and Katelyn Pope (19) were the only Kensington batters to make an impact, with seven batters failing to get off the mark.
Shae Daly was best with the ball for the Browns, taking 3/12.