How would YOU change the book? (SPOILER)

In Divergent, she makes a choice between 5 factions. SPOILER ALERT! If you have not read the first 50 pages of the book, she chooses to join the Dauntless. But how else could the book go if she chose to transfer in one of the other 3 factions or to stay in abnegation? Could there even be a book if she chose another faction.  If she chose Euridite, would she fight against them or would she join their cause? If she stayed in abnegation she would most likely not be able to revolt because she has not been trained.  If she was in either of the other two factions. She would not have known about the revolution.  So what other stories can be made if she chose different factions.