What are the motifs in The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making by Catherynne M. Valente?

A recurring idea is the power of choice. Early in the narrative, when she is en route for Fairyland, September asks Green Wind why she was chosen to make the journey. Later, when she is trapped in the bottom of a well on the island of the Tsukumogami (Chapter 17), she tells Green Wind she doesn't feel strong enough or worthy enough to complete what she believes she has been asked to accomplish. On both occasions,Green Wind reminds her that she is where she is because of the choices she has made - she chose to take the journey through Fairyland and in the way that she took it, that resulted in her being at the bottom of the well, and she chose to ride with him in the first place.