possible choices to play Cousin Miriam
Ann Sheridan, Barbara Stanwyck, Loretta Young, Katharine Hepburn, Vivien Leigh.
I'm not sure about Sheridan or Young. I don't believe Sheridan was even discussed afterwards when the role needed to be recast. Young declined because she didn't believe in horror stories for women. Leigh declined because she didn't want to work with Bette Davis. And Stanwyck was apparently approached to Jewel Mayhew but was maybe thought of afterwards for Miriam.
I would have loved to have seen Katharine Hepburn in the role. I think she would have been very interesting and cast against type like she was in 'Dragon Seed.' I believe Aldrich either didn't approach her at all or she didn't return his/studio's call.
Some other possibilities: Audrey Hepburn, Myrna Loy, Greer Garson, Irene Dunne, Maureen O'Hara and Lana Turner.
What do you think?