at the end of the novel, how does hope return to billie jo Kelly's farm

Daddy discusses what new crops to plant. Billie Jo plays her piano, letting her skin stretch. She philosophizes about hard times, saying that hard times are mostly about losing hope and spirit, not about being poor, not about dust. Daddy and Louise get married. She brings apples, perfect apples, and arranges them in a bowl on the shelf opposite Ma's poetry book. They live their lives. Billie Jo plays the piano.

This is the denouement of the novel. Billie Jo has forgiven Daddy, and they are seeing the Doc to get some help for his spots and her hands. Louise is turning out to be nice and sensitive to the history of the family she's joining. Things get all wrapped up, and the reader has a sense of hope and renewal.