DCP (northeast) R A Sanjeev said the girl was traced from a house of one Sanjay in Jyoti Nagar, who later claimed they had married each other in some temple in Amla-Bareilly in Uttar Pradesh.
The information was received yesterday night, he added.
Around 15 days back, the girl's parents, residents of Jyoti Nagar, filed a complaint that their daughter had gone missing. Police immediately launched a search and also flashed message across the country, to CBI, Missing persons Squad, and Doordarshan. However she was not found.
The parents went to the hospital next day and claimed that the body was their daughter and pressurised the cops to hand over the body to them. After getting the body, parents and near ones of the girl staged an agitation on Wazirabad Road, against the alleged police inaction in "averting her death".
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Police pacified the agitators by promising to arrest those behind the death of girl, after which the agitation was called off and the body cremated.
On the mixup, another senior police officer said that police had conducted the DNA test of the body before it was taken by the missing girl's parents.
The report is expected soon based on which the identity of the body will be established, the officer said.
Police is considering filing a case against the parents who misidentified the body, but a final conclusion has not been reached, he said.
"From the beginning, police was suspicious that this body was not of their daughter. Despite this, they were claiming that they knew their daughter very well and didn't have any doubt and was adamant to take it," Sanjeev said.