The 18-year-old Vani, who lost in a play-off in her maiden pro appearance last month, played a steady round with just one bogey against two birdies, on the fifth and 11th.
Her sole blemish came on the par-5 13th at the Prestige Golfshire golf course.
Aditi had a 74 with two birdies and four bogeys. Two of her bogeys came on second and third holes. Nalini was tied second at 74 with Aditi.
Tied in fourth place at 76 was Shraddhanjali Singh and the fifth place was shared by Smriti Mehra, winner last week, and Saaniya Sharma.
