The girl, who attends Beis Ruchel D'Satmar Girls School at 1415 54th St. in Borough Park, was about to retrieve a ball that had fallen off the roof at 3:30 p.m., cops said.

She stepped on a sky light and it collapsed, causing her to plummet 30 feet, into the Ateres Chaya Simcha Hall according to police.

The little girl, who was not named, was taken to Lutheran Medical Center, where she was listed in stable condition.