According to a major Italian social-type magazine, The Blue ferrari version involving both sisters is correct. I can recall an article in TV Guide many years ago when it was revealed that Catherine Deneuve"s sister was killed in a Ferrari. Another source identified the vehicle as a Blue Ferrari Superamerica. some web sites defend the solitary Renault crash theory. I would opt for the Ferrari angle. If so, obviously Catherine survived the accident. It was revealed somewhere she was not permitted to see the dead body of her sister, which is hard ot understand,thopugh impacts, damage could be quite different on different sides of the Vehicle. The dual theory would seem to imply That Catherine was driving(protected by the steering wheel, shift , etc. and Francoise could literally have been ejected from the car. Unlike the Jayne mansfield crash, it is not a(popular) movie star tragedy.