What happens to Rosaleen?
Rosaleen gets to vote, for one thing, something she has been struggling to do for the entire story. She remains with the sisters, as does Lily, both of them making new lives for themselves in Tiburon. We can infer that Rosaleen stays from Lily's statement as she turns away from T. Ray and sees August, Rosaleen, and the Daughters: "I remember the sight of them standing there waiting. All these women, all this love, waiting" (299). This tells us that Rosaleen will be there, too.
Sue Monk Kidd has been asked in interviews whether or not she will write a sequel to this story, but so far, she has only said she will think about it. If you have the Penguin edition of the book, you will find an interview with her at the end of the book.
I think it might be interesting to write a next chapter for Rosaleen and for Lily. Perhaps Rosaleen will become a civil rights activist. Perhaps Lily will develop her relationship with Zach. The book ends on a positive note, suggesting to us that this new family will stay together in great happiness and love.