Tynan disapproved of Dundy's writing vocation despite having forecast success, because it distracted attention from himself; however, Dundy had seen it as a means to save their marriage. Around this time Tynan started to insist on flagellating his wife, with the threat of his own suicide if she refused. Drugs, alcohol, and extramarital affairs by both parties resulted in the marriage becoming fraught, and it was dissolved in 1964. In 1962, she was a writer for the BBC's satirical "That Was the Week That Was". Dundy eventually cured herself of addictions from 1968 to 1976 and maintained her initial success as an author, while living mainly in New York. In addition to novels and short stories, Dundy wrote for "The New York Times". She wrote books on the actor Peter Finch, the city of Ferriday, Louisiana, and Elvis Presley, about whom she said "Prior to 1977, I didn't know that Elvis was alive until he died."