Ashwini Sunanda Gaware, 15, a Class 10 student of Vivekanda Sankul in Sanpada, allegedly committed suicide by jumping from the terrace of her flat on November 30.
The police are investigating what pushed the girl to end her life.
The incident took place around 7.30pm at Satyam building in sector 10 of Sanpada.
Gaware, who lived in a terrace flat, left behind a suicide note, which was found in her bag kept on the terrace.
"The suicide note said 'I Quite'. She probably meant I quit," said MM Patil, inspector, Turbhe police station.
"The note doesn't explain the reason for the suicide."