Mishra is part of India's Commonwealth Games team
Three Indian swimmers Richa Mishra, Jyotsana Pansare and Amar Muralitharan have tested positive for the banned substance methylhexaneamine.
Mishra and Pansare were both members of India's 26-member aquatic squad for the Commonwealth Games in Delhi.
Swimming Federation of India (SFI) has been notified of the results.
Last week, the National Anti Doping Agency (Nada) had pulled up four wrestlers and one shot-putter from India after failing their dope tests.
The athletes - shot-putter Saurabh Vij and wrestlers Sumit Kumar, Mausam Khatri, Rajiv Tomar and Gursharanpreet Kaur - were provisionally suspended pending a hearing.
I have been tested several times before in my career of nearly 20 years and have always returned negative
The governing body's secretary Virender Nanavati was quoted in the Indian Express as saying: "We have been informed by Nada about the three swimmers failing dope tests.
"The swimmers have informed us that they would like to go for the B-sample tests."
"If the B-sample tests also come positive then we will have no option but to drop them [Mishra and Panasare] from the team for the Commonwealth Games."
Mishra, who has bagged multiple national titles coupled with three national records, and was adjudged the 'best woman swimmer' at the last national games, maintains her innocence, while stressing she was ready to prove the Nada tests wrong.
"I have been tested several times before in my career of nearly 20 years and have always returned negative," said Mishra.
"In fact, my father is even willing to spend money to get the test done from a different laboratory abroad."