"It could have been a childless couple. Her head was shaved to conceal her identity, but she was well cared for. I think once the news got viral, they got scared and released her," said Additional Commissioner of Police S.B.S. Tyagi.
Police are probing why no ransom demand was made.
They are also exploring the possibility of the child being kidnapped by an organised gang for human trafficking or begging.
Jahnvi has not said much so far about her abductors except that she was forced to call them "mom" and "dad".
Delhi police have failed yet to apprehend any culprit involved in her abduction.
Jahnvi's kins thank to the social media tools, which helped their fight against the crime.
"We decided to go for the paid campaigns on Facebook and WhatsApp. So just as people get messages about homes and plots, one lakh WhatsApp users would get messages about Jahnvi," said Tarun Grover, Jahnvi's maternal uncle.
Explaining about their "Bring back Jahnvi" campaign, Grover said: "We are 10 siblings and we divided our works."
As an investment professional, Grover handled social media.
And finally, Jahnvi, who had gone missing from India Gate on Sep 28 while on an outing with her family, was found Oct 5 in a market in Janakpuri with her head shaved and a placard carrying her name around her neck.
Victim's father Rajesh Ahuja said that the police warned him not to held a candle march at Jantar Mantar.
"The police's warning was against such an aggressive campaign because the abductors could have hurt the child," Rajesh told IANS.