Who is Sweet from The Dance of the Dissident Daughter: A Woman's Journey from Christian Tradition to the Sacred Feminine and what is their importance?

Sweet was Sue Monk Kidd's African-American nanny. When Sweet needs to relieve herself during a drive, they stop by a stand of trees, because gas station restrooms are for whites only. At age eleven, the inhumanity of it strikes the author, as she joins Sweet in the trees. They watch their streams of urine form a river. As she is grounding herself, Sue often dreams about Sweet. In one, Sweet gives her a box to keep her snake in. Sue recalls visiting monasteries and being required to sit, segregated in the balcony, as blacks are in movie theaters in her youth.