What does Nadira discover about Lily Yee's father in Section 9: Chapter 11? How?

Nadira spies on the manicurist with whom Lily's father is accused of having an affair, following her home and gaining admittance to her apartment by claiming to sell Girl Scout cookies. After seeing pictures of Lily's father with the manicurist and a baby throughout the apartment, Nadira leaves to meet Lily and tell her everything.