Question: How many films did the actress that is starred in the comic play by Noel Coward and is bet known for her outstanding stage triumph in the role of Blanche du Bois, appear in?
Sentence (from "Betty Ann Davies"): Her outstanding stage triumph was in the role of Blanche du Bois, which she took over from Vivien Leigh, in the original West End production of " A Streetcar Named Desire".
Relevant evidence: Yes