Why does sal realize about the departures of her mother and phoebes mother in chapter 27?

In Chapter 27, Sal realizes that both her mother and Phoebe's mother left home because of a similar longing for freedom and independence. She understands that their departures were not a rejection of their families, but rather a necessary step in their personal journeys to find themselves and pursue their own dreams. Sal comes to see the parallels between their situations and gains a deeper empathy and understanding for her own mother's actions.