A 15-year-old girl died Friday when she plunged six stories from a Manhattan apartment building while trying to jump from one roof to another, cops said.

Natalia Jimenez, who lived in Chelsea, was hanging out after school with two pals on the roof of the Hell’s Kitchen building when a tenant confronted them, telling them to get inside, according to law-enforcement sources.

Instead, Jimenez ­attempted to leap from the building onto another roof. But she slipped on the ledge and fell into a small space between the buildings on Tenth Avenue between West 47th and 48th streets.

“She was the best girl a mother could have,” her mom, Agatha Mangano, said at their apartment Friday night. The distraught mom added that her teenager was “good hearted and friendly.”

A neighbor at the scene of the fall said people would go to the roof to enjoy the view and to party.

“People hang out up there all the time,” said the neighbor, Justin Lipper. “I always feel unsafe going up on the roof because I never know what I’m gonna find.’’

After the tragic fall, Natalia was rushed to Mount Sinai West hospital where she died.

On the rooftop late Friday, a portion of mesh netting meant to prevent people from falling from the ledge could be seen torn to shreds as investigators combed the scene.

Natalia’s mother said she was worried about the new friends with whom her daughter had ­recently started hanging out.

“I know my daughter, she never would’ve went on this roof,” the mom said. “She was a good girl, she never got into trouble.

“She had just started high school and she’d just started hanging out with this girl.”

Natalia’s grandfather, Rosalino Mangano, owns a Famous Original Ray’s Pizza below their apartment on Ninth Avenue.

“She was the best little girl in New York,” Mangano said.

A neighbor remembered Natalia as a happy kid who hung out at night in the pizzeria. “She was fun,” Daniel Bauer said. “She was friendly, always fooling around.”

Additional reporting by Jamie Schram and Joe Tacopino