What event directly precedes Starla's journey to find her mother in the novel, Whistling Past the Graveyard?

Lulu sends Starla a demo record from Nashville which Mamie tries to throw out without Starla knowing. Starla listens to the record and believes her mother is famous. It helps to fuel the dreams Starla has about going to live with her mother in Nashville. It helps to create an erroneous vision in Starla's mind of what her mother and her mother's life must be like.