Lily finds herself making choices based on signs she interprets, what is she trying to decide based on seeing the crop duster flying over the tops in Tiburon?

In this scene, Lily is trying to decide whether or not she should remain living in an uncertain world filled with questions and fear... or move on... begin her journey of personal identity and self discovery. The flight of the crop-duster serves as a metaphor for breaking away, beginning the journey.