The girl managed to escape from the hotel and came back to Delhi within 24 hours after which she reported the matter to the police.
Six persons, arrested so far in connection with the incident, have been identified as Rocky, Rani, Mahesh, Anil, Arjun and Kamal, said DCP (Outer) Vikramjit Singh.
Six more persons who had allegedly raped the girl are yet to be identified.
On August 30, the duo took the girl to Jaipur and lodged her at a hotel, where one of the accused, Mukesh, works as a manager. Mukesh and his associates allegedly raped her in turns until the girl managed to escape from the hotel and reached Delhi by a bus on August 31, Singh said.
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The matter was reported at Mongolpuri police station on September 1 by the minor, he said.
Later a team was sent to Jaipur and the others were arrested, said a police official.
It has also emerged that the hotel, where the crime took place, was earlier raided by police for aiding prostitution rackets, said the official.
"A case has been registered under Sections 372 (selling minor for purposes of prostitution, etc) and 376 G (gang rape) of IPC and relevant sections of Protection of Children from Sexual Offences (POCSO) Act," said Singh.
The girl's father works as a vegetable vendor and is an alcoholic. The girl was in a desperate need of employment to meet the daily needs of the family, said a police official.
The police are also checking records to ascertain if Rocky and Rani have criminal cases registered against them and whether they have trapped other victims as well, they added.