Around 100 firefighters were called to a fire in a block of flats in northern London.
The London Fire Department said she was summoned to Grange Estate in East Finchley shortly after midnight.
Part of the roof of the three-story building was burning, said the brigade.
A video posted on social media showed firefighters running on the building as flames leapt into the sky.
The Metropolitan Police said they support the LFB after being called to the scene at 1:30.
A Scotland Yard spokesman said, "An evacuation process is under way. The local authority was informed. Injuries are not known at this time. "