The Aussie is now up to a career-high 469 rating points in the All-Rounder ODI Rankings, 25 points ahead of next-best Kapp.
She has also set a new career-best of 648 rating points as a batter, having climbed five spots to break into the top 10 of the list.
Gardner scored her first ODI ton against England, compiling a run-a-ball 102 in Hobart. That performance followed another Player of the Match effort in the first One-Dayer at North Sydney Oval, where she took 19-3 off 6.1 overs before hitting 42* off 44 balls to steer Australia home and help the hosts get off to a strong Ashes start.