Can you describe Mavshibai's unique method of service to Sai Baba that led to the confrontation with Damu Anna?

Mavshibai, whose original name was Venubai Kaujalgi, served Baba with incomparable devotion. Her method of massaging his stomach was particularly extraordinary and intense. Chapter 24 details how, absorbed in Sai's name, she would twist with both hands and begin "grinding" his stomach, pressing and churning it "like a pot of buttermilk." This vigorous service, which made Baba's stomach and back appear flat, caused her to sway up and down. It was during this swaying motion that her face inadvertently came close to Damu Anna's, which set the stage for her humorous accusation and the subsequent quarrel.