The girl, who was last night shot at inside her house in the south-east Delhi locality, is battling for her life at Max Hospital in Saket.
According to her family members, the victim is on ventilator support in the hospital's Intensive Care Unit.
"My daughter has just one per cent chance of survival," said Shafiq Khan, the girl's father.
Meanwhile, police are yet to arrest either of the two youths involved in the attack.
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The victim's mother, Shahnaz, said her daughter was shot at by the boyfriend of a female acquaintance whom she had slapped following a disagreement yesterday.
"My daughter went to pick up her younger sisters from school in the afternoon. She'd met a female friend of hers then but they got into an altercation and my daughter slapped her," said Shahnaz.
"At around 8:45 P.M., two men barged into our house. One of them said that my daughter had not done the right thing by slapping his girlfriend.