 According to Ms. Davis, she was so disgusted by the script that she  demanded it be rewritten, and left when the filmmakers refused. The  script was then reshaped to explain her absence.  Larry Cohen (I) (qv) says Davis had to leave for New York for  medical reasons and that she later claimed she left because of the  script because she was worried she wouldnt be able to get another  job if people thought she was in too bad health.