Port Adelaide won the toss and elected to bat, with Alicia Dean (44) and Armapal Kaur (26) combining for a 64-run partnership after Mary Waldron (19) was dismissed.
Aiming for 135, the Jets made light work of the chase, with Katie Rowe (22), Caitlin Wendland (39) and Betts (58 from 32 balls) getting their side across the line with four overs to spare.
Southern Districts finished their innings with 117, thanks to a 47-run knock from Kelly Armstrong.
A tight bowling attack from Southern Districts sparked a Kensington middle-order batting collapse, with the Browns losing 3/0 and ultimately losing the match, reaching just 8/82.
Kensington’s Sarah Lowe and Southern District’s Jess O’Reilly both took three wickets.
Kayla McGrath led the way with the bat for West Torrens (38), getting the Eagles to 5/109 after 20 overs.
Sturt struggled to find runs and were dismissed for just 78, with West Torrens’ Ellie Falconer starring with 3/15 and a runout.