According to officials of its Education department, the girl complained of stomach ache on May 5, a day after she was given Iron Folic acid tablet.
School authorities had sent her home thinking "it was menstrual pain", the official said. The Delhi Police has initiated an inquest proceeding into the matter under Section 174 of CrPC.
"Parents took her to a local doctor who administered glucose. But after swelling was reported, she was shifted to Hindu Rao hospital where she died yesterday. The government has ordered an enquiry by SDM Saraswati Vihar into the death," said the official.
The postmortem report of the deceased is awaited, police said.