What method does Amal use to rebalance her friendship with Adam in Chapter 33?

Amal thinks about the importance of having the "upper hand" (274) in a friendship, or even within a rivalry, like the one she has with Tia. Amal then applies this thinking to her friendship with Adam, considering that perhaps he had gotten the upper hand with his two weeks of sulking. In order get the friendship back into a balanced state, Amal writes a silly note to Adam during class.