I’ve just finished reading all the posts. I think some history is in order. Try Women in Landscape Architecture: Essays on History and Practice edited by Louise Mozingo and Linda Jewell.
Also, if you can find A Century of Women, there’s a chapter in there by Sally Schauman who, among other things, established the MLA Program at the University of Washington and served as Chair of the Department for 12 years. The chapter is called, “Landscape Architecture: A Gendered Past, A Feminist Future.”
Hope this helps!