She died at the scene and the coroner has been informed.
Yorkshire reporter David Spereall said there was no sign of a police cordon when he arrived at the scene.
He said a small number people had gone in and out of the flats since he arrived and one woman, believed to be a relative, stopping to lay flowers.
Councillor Luke Farley said the incident was “deeply distressing” and he was “saddened” by the news.
The Labour councillor said the area was full of young families and the tower block had been refurbished four or five years ago.
Sending condolences to the woman’s family, he added: “I also want to reassure residents that there will be a police presence there over the next day or so.”
