Diksha Dagar came up with a superb 11-under in the last round to win by a huge margin and clinch the gold medal at the Deaflympics, in Tokyo, on Thursday.
Lahiri squeezed himself into the top 60 as the final qualifier on the list published by the International Golf Federation on Tuesday.
Aditi qualified in 45th place and will now play in her second Olympics.
Diksha, who was born with a hearing impairment, will now have the unique honour of having represented India at both the Deaf Olympics in 2017, where she finished second for a silver medal, and the Tokyo Olympics 2020.
The governing boards of the OWGR and WWGR determined in March that the rankings would be suspended due to the COVID-19 pandemic, which forced the 2020 Tokyo Games to be postponed until July 23-Aug. 8 next year.
Anirban Lahiri and SSP Chawrasia will be representing the nation at the Olympic Games in Rio de Janeiro.
Udayan Mane on Tuesday qualified for his maiden Olympic Games, becoming the second Indian male golfer after Anirban Lahiri to make it to the mega-event, starting in Tokyo from July 23.
The extension of qualifying period gives, at least half a dozen others among Indian men and possibly one woman, a chance to bid for a place in the Games.
Golfer Siddikur Rahman has become Bangladesh's first athlete to qualify for Olympics after finishing 56th in the final eligibility rankings for the Rio Games.
Summary of sports events and persons who made news on Friday
All 11 Russian boxers who qualified for the Rio Olympics have been given the all clear to compete at the Games, the International Boxing Association (AIBA) said on Thursday.