Can you tell me more about Mavshibai and her unique way of performing service for Sai Baba?

Mavshibai, whose original name was Venubai Kaujalgi, was a devoted, widowed follower whom Sai Baba affectionately called "Mother" (Aai). Chapter 24 highlights her unique and intense method of service. While massaging Baba, she would become completely absorbed, pressing and churning his stomach with both hands as if it were a pot of buttermilk. Her method was so vigorous that her whole body moved, and it was described as making Baba's stomach and back flat. While this extraordinary service made another devotee feel pity and concern for Baba, Sai himself seemed completely at ease, accepting her service as an act of pure, guileless love.