The victim, identified as Yashi Shah, was playing in the balcony of bedroom of the flat when she slipped, a senior official said, adding that the incident occurred at around 1 PM
She was rushed to a nearby hospital, where doctors declared her brought dead.
Police have ruled out a foul play in the incident and have registered a case of accidental death.
A detailed statement of Yashi's father Manish Shah has been recorded, the official said, adding that further is on.