The incident took place last evening when the girl was watering her fields in Nagardih village here, they said.
After the ill-fated incident, the girl narrated her ordeal to family members upon which her aunt accompanied her to Piparpur police stationto lodge a report, police said.
When the condition of the girl deteriorated, doctors of CHC Bhadar referred her to district hospital, Sultanpur.
She breathed her last this morning. The victim's statement was recorded by a magistrate at Sultanpur hospital, they said.
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The Piparpur police then lodged an FIR against one named and two others.
When the matter came to the notice of IG Zone police, officials of Amethi rushed to the spot but faced the ire of villagers who alleged that local police was negligent in the case, police said.
One of the accused Suraj Pandey has been arrested.
The girl's post-mortem examination was conducted today, they said.
When contacted, SP Amethi S K Singh told PTI that after the post-mortem report comes out, the victim's statement will be looked at by the police.