The body of the girl, who had been missing for the past three days was fished out of Haorang river in Imphal East district yesterday, the police said.
The body was spotted by some youths, who had gone to take bath in the river.
Family sources said the girl was missing for the past three days but they believed that she had gone to the house of her maternal grandfather.
They came to know of the incident yesterday.
Police said the body, which bore injury marks, has been sent for post mortem.