The 18-year-old, who won her first pro title while still being an amateur last year, won the third leg in Golfshire Prestige, and added the second title in the seventh at the Delhi Golf Club.
She carded a one-over 73 to finish the week at seven-over 223, four shots clear of Nalini Singh Siwach (79), who was also docked a stroke for slow play on the par-five 15th.
In the end, it did not make a difference as Nalini, already four-over for the front nine, carded 79 and finished second at 227.
With her second success, Vani has become the second multiple winner of the season after Smriti who has won three titles. Other winners this year have been Nalini Singh Siwach and Sharmila Nicollet.
Smriti, who led Nalini by two shots overnight, and Vani by four, simply blew her round with a card of 11-over 83 and dropped to third at 229, where she tied with Saaniya Sharma (73). Smriti was also penalised a stroke for slow play on the par-4 15th.
Neha Tripathi also had a nightmarish day with a round of 83, including a 10-over 46 on the back nine. She seemed fine after the one-over front nine, but then managed only three pars on back nine and dropped 10 shots.
Also Read
Vani, who is coached by Anitya Chand, opened with a birdie but double bogeyed the par-four fourth but got back to even par with a birdie on the ninth. She bogeyed the 12th and 13th, but closed the tournament with a birdie on 18th to win the title.
"I have never managed to win at DGC and I have finished second so many times here, so this win is really special. The DGC course is always a challenge and I am so glad I was able to repeat a win after getting my first as a pro in the early part of the season," said Vani, who picked up Rs 1,41,250.