What is a short summary of the story, Gospel Song, from the collection, Trash: Stories?

In the story, Gospel Song, the narrator is obsessed with gospel music, and despite her own bad voice, dreams of becoming a gospel singer herself. The narrator befriends an albino girl her age named Shannon Pearl, whose parents run a gospel music circuit. The narrator takes care of Shannon, but is also jealous of her since Shannon’s parents dote on her. Most people in the world are cruel to Shannon, however, and by the end of the story the narrator and Shannon have decided they will eventually enact revenge on those who have wronged them.