Here's the story, from this very site!
Despite the legend, she was not ostracized by society nor rejected by her family. The myth of "Molly" Brown has very little to do with the real life of Margaret Tobin Brown, although it speaks to her spirit. Margaret was never known as "Molly": the name was a Hollywood invention. The story began in the 1930s with the colorful pen of Denver Post reporter Gene Fowler, who created a folk tale, and sensationalist writer Carolyn Bancroft, who wrote a highly fictional account for a romance magazine that was turned into a booklet. This story enjoyed various radio broadcasts during the 1940s and was the basis for the Broadway play, "The Unsinkable Molly Brown", which eventually became the MGM movie of the same name, starring Debbie Reynolds. Even James Cameron's 1997 film "Titanic" has very little to do with the real story of Margaret Tobin Brown. After attempting to mitigate or correct the legend of "Molly," the Brown family eventually withdrew from the public and refused to speak with writers, reporters, or historians. Only recently have they agreed to cooperate with the efforts of a historian, Kristen Iversen, and allowed access to letters, scrapbooks, photographs, and many personal effects of Margaret Tobin Brown that had previously been unavailable. The first full-length biography of Margaret Tobin Brown was published in June, 1999.