Vani started her day as the joint leader and returned the best card of the tournament to win her fourth title of the season in 10 appearances.
Saaniya Sharma of Chandigarh carded 1 under 71 to end runner-up.
Hero Order of Merit leader Vani played brilliantly to finish with a final score of 214. She started the day on a positive note playing a bogey-free front nine, with two birdies on the 1stand 7th holes.
She now has more wins than any other golfer in the season, and victory here will open up a substantial lead for her in the money list.
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Runner-up Saaniya started the day in third position, and sank a birdie on the 1st hole. She played a bogey-free front nine and kept up the chase. Saaniya began the back nine carding a birdie on the 10th and 13th holes. However, two bogies on the 12th and 17th undid her effort and she had to be content with the second spot with a total score of 219.
However, she adjusted herself to the conditions well, and played a blemish free back nine with two birdies on the 11th and 13th holes to end the round at 2 over 74.
Kolkata's Neha Tripathi dropped four shots on the 2nd, 9th, 11th and 15th holes, with a lone birdie on the 4th hole to finish the day with a score of 3 over 75.
Eventually, Mehar ended the day at a score of 7 over 79 and took the fifth position with a total score of 225.
Panchkula's Amandeep Drall, Delhi's Ankita Tiwana and Kapurthala's Gursimar Badwal, all ended with a total score of 226 to finish tied sixth. Pune's Shweta Galande with 227 and amateur Suchitra Ramesh with 229 ended 9th and 10th respectively.