"I hate her," I said, and waited for the blow to fall. But Doctor Nolan only smiled at me as if something had pleased her very, very much and said, "I suppose you do." (16.93)
Dr. Nolan here lets Esther express her feelings about her mother honestly. Just getting the chance to express her feelings has therapeutic value for Esther. In the past, she's been so worried about what others think of her that she hasn't really had the chance to be honest with herself.