Just wanted to know if you have ever searched in the University of Washington libraries catalogue. If you search with "frances farmer" as keyword you will get an entry for "Lois Kibbee papers, 1968-1981" which contains the following:

Description ca. .63 cubic ft
Scope Correspondence, 1968-1970 with Frances Farmer and her associates, ephemera, publicity photos, videotapes of movies in which Farmer starred
Access Access restricted. Contact the repository for details
Usage limits Some restrictions exist on duplication, quotation, or publication. Contact the repository for details
Note Processing levels vary. Contact the repository for details
Biography Kibbee, an actress and writer, worked with Farmer and her companion, Jean Ratcliffe, on a projected biography of Farmer.

link:
http://catalog.lib.washington.edu/search/Xfrances+farmer&searchscope=6&SORT=D/Xfrances+farmer&searchscope=6&SORT=D/1%2C8%2C8%2CB/frameset&FF=Xfrances+farmer&SORT=D&8%2C8%2C

Did you know about that? Have you ever accessed this material? It seems VERY interesting...