Her death is being treated as “unexplained”, police said.
A Scotland Yard spokesman said: “Police were called after a woman was found unresponsive.
“Officers attended along with the London Ambulance Service.
The body of 46-year-old woman was found at the scene. Her next of kin have been informed.”
A London Ambulance Service spokesperson said they were called to reports of an “incident” at the junction between Yester Road and Southill Road.
“We sent a number of resources to the scene, including an ambulance crew, an advanced paramedic, a medic in a fast response car and an incident response officer.
“Sadly a patient died at the scene.”
Enquiries are ongoing and anyone with information that could assist the investigation is asked to call 101 quoting CAD 1373/20Jan. To remain anonymous contact the independent charity Crimestoppers on 0800 555 111.