Aditi, who was five-under through 17 ended with a double bogey, which took her from 14-under to 12-under.
Angel Yin, displaying her vast potential and power off the tee as well as a soft touch around the greens, won in a three-way playoff to capture the title in a riveting finish at Emirates Golf Club.
Aditi, who was tied-4th after the third day, had a slow start with two birdies on front nine, but she did make a charge adding two more on 12th and 13th.
Aditi finished seventh on the Order of Merit, which was won by Georgia Hall of England.
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The 19-year-old Los Angeles native Angel saved par after finding the water on the closing hole in a bogey-free final round of 67 to match the clubhouse target of a 15-under-par set by South Korea's In-Kyung Kim and Celine Herbin of France.
Long-hitting Yin and Kim birdied the first extra hole (the 18th) to stay in the hunt, while Herbin was eliminated after finding the water with her third shot.
Herbin, who shot a final round of 64, wasn't too disappointed at being eliminated with a double-bogey on the 18th hole after finding the water with her third shot.
Overnight leader Anne Van Dam fired a final round of 71 and ended two strokes back in fourth place, with Aditi, Charley Hull and Pernilla Lindberg tied for fifth.
Thidapa Suwannapura was eighth, while Olivia Cowan and Michele Thomson completed the top 10 spots.
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