In the tournament's opening match she scored an unbeaten 42-ball 89, in Spirit's second she bowled the death over, successfully defending six runs with two to spare, and now she has hit an unbeaten 32-ball 50 to guide Spirit to victory at Old Trafford.
Chasing Manchester Originals' 7-122 Spirit won by three wickets with two of their 100 balls remaining, thanks to a late flurry of boundaries by the Queenslander.
"I just thought it was a bit of a trickier wicket to start on, and then once you got in, you could try and cash in at the back end," said Harris. "When we got to about needing 26 runs, I thought 'we're pretty good'. We'd got wickets in hand; we could try and take the game on a little bit more.
"I'm delighted with how I'm going. I think a lot of the principles that I've been working on within my game are paying off, and I just keep summing up conditions and whenever I'm injected into the game, I'm seeing what impact I can have."
Put in to bat Originals were 2-10 off 12 balls, including Kathryn Bryce out to a brilliant leg-side catch by wicketkeeper Georgia Redmayne, standing up to pacer Tara Norris.Â
Skipper Beth Mooney (26 off 20) counter-attacked creating a platform for West Indies' Deandra Dottin (36 off 30) to lift the home side to a potentially defendable total.
Kira Chathli got the reply off to a good start with 34 off 30 after Redmayne perished for 11, but Spirit slid to 5-97, needing 26 runs off 16 balls.
Harris brought that down to nine from eight with a pair of sixes but Bryce took two wickets in two only for Sarah Glenn to edge, then drive boundaries to ensure Harris's half-century was not in vain.
Harris is now the highest run-scorer in the competition with 157 followed by fellow Australians Meg Lanning (141) and Mooney (97). She also has the highest strike-rate (178.4) followed by another Aussie in Ash Gardner (175), and most sixes (9) followed by Lanning (6).
