Gursimar shot one-over 72 to get to a total of 5-over 218 and emerged a winner by three strokes over Kolkata's Neha Tripathi (75).
Gursimar and Neha had shared the lead after the second day but the former ensured fewer mistakes and a far more steady round than all others in the field.
Gursimar's round of 72 was by far the best of the day. The next best card came from Neha, who shot 75 and ended at 8-over 221.
The win also took Gursimar into sole lead in the Hero Order of Merit with a total of Rs. 2,76,000 in three events so far. Neha is now second with Rs. 2,46,000 and Tvesa Malik is third with earnings of Rs. 2,32,000.
Tvesa (77), who was third behind Gursimar and Neha, was nine shots behind the winner, Gursimar.
Ayesha Kapur (77) was fourth at 229 with Saaniya Sharma (81) finishing fifth at 230.
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