Some persons spotted the body lying in the fields of Sankhole village this morning, police said.
Kailash, a resident of Sidharthnagar district in Uttar Pradesh, in his complaint had said he owns a shop at Sector-6 turn in Bahadurgarh area here.
According to Kailash, his daughter left the house on the evening of August 5 and did not return back.
Police suspect that the girl might have been sexually assaulted before being killed.
The body has been taken to civil hospital for post mortem, police said.
"We have started probe into the matter. Post mortem report will confirm that whether the girl was sexually assaulted or not," Bahadurgarh DSP, Rajeev Deswal, said.