The Browns posted 6/114 after their 20 overs, with Sarah Lowe (49) and Cara Fiebig (27) the standouts with the bat.
Opener Treloar carried her bat, compiling 59 in reply, while getting her side to the required total with just three balls to spare.
Southern District’s Kylie Rattray belted 42 from 26 balls in another impressive T20 innings, which included five boundaries and three sixes.
The Stingrays made 8/111, which Sturt were unable to chase, despite efforts from Emma de Broughe (23) and Rhianna Peate (29).
Three wickets from Stingrays captain Jess O’Reilly (3/21) helped to slow the Blues in their chase.
Port Adelaide welcomed back Ireland player Mary Waldron, fresh from the ICC World T20, however it was young Northern Districts quick Darcie Brown who dismissed her for just seven runs.
The Magpies managed just 5/63 in their 20 overs, with the Jets chasing the total in 12 overs, thanks to Katie Rowe (28) and Stephanie Beazleigh (18 not out).