Khushboo, daughter of Mohammad Hussain, collapsed during the clashes between protestors and security forces at Vehil in Shopian district, a police official said.
He said the girl was taken to Shopian district hospital where doctors declared her "brought dead".
The preliminary cause of death was stated to be cardiac arrest, police said.
With this death, the toll in the ongoing unrest in Kashmir since Hizbul Mujahideen commander Burhan Wani was killed in an encounter with security forces on July 8, has risen to 82.
They said fire tenders have been rushed to the spot, adding the cause of fire was not known yet.
No casualty has been reported in the incident so far, police said.
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