The mother of the 5-year-old girl who was found battered and lifeless inside her Queens home Wednesday made a bone-chilling confession to a 911 operator — coldly telling them “I killed my daughter,” law enforcement sources said.

The woman made the disturbing admission to a dispatcher before police were summoned to the home on 110th Street near 95th Avenue in South Richmond Hill just before 7 p.m., according to the sources.

When police arrived, the girl’s mother – who was waiting at the front door, according to a neighbor – told them, “She’s upstairs not breathing,” the sources said.

Once upstairs, officers found the girl unconscious and unresponsive, lying face-up with blood coming out of her nose and a weak pulse, according to the sources.

She was rushed to Jamaica Hospital Medical Center in critical condition, where she was later pronounced dead, police said.

Her official cause of death will be determined by the city’s Office of the Chief Medical Examiner.

Her mother – who appeared stoic and didn’t shed a tear – was carted away in handcuffs, according to the neighbor who identified himself as Carlos.

“She was not crying, it was like nothing happened,” he recalled. “It’s too much emotions together. I feel sad for the child.”

Carlos remembered the girl as a very happy child, always bubbling with energy and wanting to give him and everyone she knew a hug.

Erika Santiago, 43, a licensed practical nurse who lives across the street, said she heard “a lot of yelling” Wednesday night before the emergency response.

“I heard about this when I woke up this morning at 6 o’clock and it’s absolutely devastating, devastating,” said Santiago, who has two daughters of her own, 10 and 12. “And it’s right across the street and they brought her to the hospital I work at. It’s so close to home.”