What was the nature of Mavshibai's service to Sai Baba, and how did it lead to her interaction with Damu Anna?

Mavshibai, whose original name was Venubai Kaujalgi, was a deeply devoted widow whom Baba called "Mother." Her service was physically intense and performed with guileless love. Chapter 24 describes how she would "grind" Baba's stomach, twisting and churning with both hands as if it were a pot of buttermilk, causing his stomach and back to become flat. Baba remained completely at ease during this extraordinary service. It was during this vigorous, swaying motion that her face came close to Damu Anna's. This proximity prompted her to make a humorous but provocative comment, accusing Anna of trying to kiss her, which sparked their brief quarrel.