Confinement: A Divergent Fanfic

This is after Allegiant, only Tris and Lynn are alive. Shauna is not paralyzed either... Tobias is cheating on Tris with an initiate and she doesn't take it well. She and Christina run from the city and don't tell anybody about Tris's unborn child(yes it's one of those fanfics). What will happen when her daughter wants to go to Dauntless and Tobias discovers that Tris is engaged?