The 40-year-old Smriti shot the week's best card of four-under 66 to total 207, while Sharmila (70) finished at 209 to be second. Nalini Singh Siwach (71) totaled 211 and was third.
Smriti started the day two behind. That deficit became four as overnight leader Sharmila Nicollet opened with two birdies. Then Smriti fought back and played the last 16 holes in four-under despite two bogeys.
Neha Tripathi (71) was fourth at 214. Vani Kapoor played her best round of the week at two-under 68 and moved to tied fifth with Shraddhanjali Singh (72) at 220.
Amateur Ankita Kedalya (69) totalled 216 and was the top amateur and overall she was fifth.
Sharmila had a birdie-birdie start on the third and final day as Smriti opened with pars. At that stage, Sharmila was four shots ahead.
Both Sharmila and Smriti birdied the third before the former double bogeyed the fourth while Smriti parred it.
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The drama continued as Smriti bogeyed the fifth and Sharmila parred and the gap was still three.
Sharmila parred the next four, while Smriti playing aggressively and birdied sixth and seventh. At the turn Smriti was only one behind Sharmila for the tournament.
The decisive and final swing came on the par-5 12th, where Smriti reached the green in two and then birdied, while Sharmila bogeyed the hole to fall behind.
Smriti then birdied the 16th and 17th and opened a three shot lead as birdies continued to elude Sharmila. On the 18th and final, Smriti could even afford the luxury of a bogey to romp home a two-shot winner. (MORE)