What happened when Sultana returned from her trip?

Sultana returned from her trip to learn her mother was dying. Sultana and her sisters remained by their mother's side until the end came. After her death, Mother was buried in an unmarked grave in the middle of the desert as was the tradition in their country. Sultana made an attempt to be happy at the burial because in their culture, to grieve over the death of loved one was to show disrespect to God.