how did she die?
Whilst attempting to walk to the bathroom her lungs filled with liquid - owing to tuberculosis, she collapsed and suffocated.
Vivien Leigh
On the night of 7 July 1967, Merivale left her as usual at their Eaton Square flat to perform in a play, and he returned home just before midnight to find her asleep. About 30 minutes later (by now 8 July), he entered the bedroom and discovered her body on the floor. She had been attempting to walk to the bathroom and, as her lungs filled with liquid, she collapsed and suffocated. 
who played scarlet in gone with the wind Vivien Leigh what is her profession? Vivien Leigh was a British stage and film actress. when was she born? 5 November 1913 did she suffer from any disease? Yes - nervous breakdown.
wiki:19600053
Vivien Leigh [SEP] 1961–1967: Final years and death
About 30 minutes later (by now 8 July), he entered the bedroom and discovered her body on the floor. She had been attempting to walk to the bathroom and, as her lungs filled with liquid, she collapsed and suffocated. Merivale first contacted her family and later was able to reach Olivier, who was receiving treatment for prostate cancer in a nearby hospital. In his autobiography, Olivier described his "grievous anguish" as he immediately travelled to Leigh's residence, to find that Merivale had moved her body onto the bed. Olivier paid his respects, and "stood and prayed for forgiveness for all the evils that had sprung up between us", before helping Merivale make funeral arrangements; Olivier stayed until her body was removed from the flat.