Aditi, who is dividing her time between her main Tour, the Ladies PGA and the Ladies European Tour, where she won twice in her rookie year in 2016, shot rounds of 71-70-60.
On the final day, Aditi had six birdies against three bogeys. She fought hard to move up the overnight position of tied 13 even though the eventual winner, Jiyai Shin of Korea was a runaway winner.
Jiyai added a final 64 to her earlier rounds of 65 and 68 for a total of 19-under while Minja Lee faltered with a 73 and finished second at 13-under.
The 29-year-old from South Korea Jiyai rallied from three strokes behind Minjee Lee to claim the title by six strokes for her 50th career win and her second at Royal Canberra Golf Club.
With three successive rounds of 68, the long-hitting Dutchwoman Anne Van Dam moved up into third position on 12- under-par, which booked her place in next week's Women's Australian Open at Kooyonga Golf Club in Adelaide.
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