What was the source of the argument between Damu Anna and Mavshibai while they were serving Sai Baba?

The argument between Damu Anna and Mavshibai, both of whom were mature in age, ignited while they were serving Sai Baba. Chapter 24 describes how Mavshibai was vigorously massaging Baba's stomach, swaying back and forth with such absorption that her face came close to Anna's. Seizing the opportunity for humor, Mavshibai playfully accused Anna, saying, "What, Anna, why are you following me? First, give me a kiss," and then chided him for his gray hair. Offended by this, Anna rolled up his sleeves in anger, exclaiming that he was not a fool and that she had brought her face to his, which escalated into a full-blown quarrel.