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.
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.
Aditi birdied the second, sixth and seventh and dropped shots on fourth and ninth to turn in one-under, while she birdied 12th, 14th and 17th on the back nine against a sole bogey on 16th.
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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