The Indian Golf Union's ladies amateur order of merit, Aditi shot four days total of 11-under 285 (71,73,70,71) at the par 74 Moortown Golf Club.
The 17-year-old Bangalore girl, who had earlier won the St Rule Trophy at St Andrews in July this year and finished second in the 2015 European Women's Amateur Championship, also claimed the overall title called 'The Nicholls Trophy' as well as the 'Dinwiddy Trophy' given for the lowest score by an U-18 player.
Currently 52nd in the World Amateur Golf Rankings, Aditi beat 39 players from around 30 countries including the 2015 Scottish Open Amateur Strokeplay winner Olivia Mehaffey of Ireland, who also took the second spot at six-under 290.
"I played consistently over all four days which was the key for me. Though I could have scored better on many holes, I am pleased with an 11-under finish," said an overwhelmed Aditi, who is also the youngest Ladies British Amateur Stroke Play Championship winner.
"It's fantastic to see Aditi go from strength to strength. Great to see her performing internationally. Hope she can carry on and do well at the highest levels. I wish her all the luck and success," said Lahiri, who recently finished tied fifth at the PGA championship in USA, the highest by an Indian in a Major.