Gauri finished one stroke ahead of Day 2 leader Ridhima Dilawari with an aggregate score of 218 at the end of 54 holes of golf.
Ridhima, who had a total of two bogeys over two days, tripled that count on the day it mattered most, to fritter away a four-stroke advantage she held before the start of the final day.
Seher Atwal, who registered the only eagle of the tournament at the par five 14th, eventually finished third, carding an even par 72 to finish with a score of 220.
Other fancied players to finish in the top 10 included the likes of Gaurika Bishnoi (232) who finished fifth and Millie Saroha (235) who finished sixth.