What does the preface say about the specific contributions of female saints, such as Mirabai, to the Sadguru tradition?

The provided excerpts from the preface (Chapter 0) do not mention Mirabai or any other female saint by name, nor do they discuss their specific contributions as a distinct group. However, the text does offer a broad and inclusive definition of who a Sadguru can be. It explicitly states that a Sadguru can belong to any caste or religion and can manifest in various forms, including 'mother, father, siblings, friend, husband or wife.' This suggests that gender is not a limiting factor in being a Sadguru, even though the text does not elaborate further on the role of female saints.