Passage: Leigh appeared with Robert Taylor, Lionel Barrymore and Maureen O'Sullivan in A Yank at Oxford (1938), which was the first of her films to receive attention in the United States. During production, she developed a reputation for being difficult and unreasonable, partly because she disliked her secondary role but mainly because her petulant antics seemed to be paying dividends. After dealing with the threat of a lawsuit brought over a frivolous incident, Korda, however, instructed her agent to warn her that her option would not be renewed if her behaviour did not improve. Her next role was in Sidewalks of London, also known as St. Martin's Lane (1938), with Charles Laughton.Olivier had been attempting to broaden his film career. He was not well known in the United States despite his success in Britain, and earlier attempts to introduce him to American audiences had failed. Offered the role of Heathcliff in Samuel Goldwyn's production of Wuthering Heights (1939), he travelled to Hollywood, leaving Leigh in London. Goldwyn and the film's director, William Wyler, offered Leigh the secondary role of Isabella, but she refused, preferring the role of Cathy, which went to Merle Oberon.

Question: what role was  she offered in Samuel Goldwyns production?
Heathcliff