Edith was on Tris' dad's side. She was an ancestor who carried on the Prior name. Even though Edith is an Abnegation name, she was actually an Erudite.Prior FamilyCaleb Prior points this out and also notes that many people of the Prior family were also Erudite. There were seven generations from Edith to Tris, according to Caleb in Allegiant.InsurgentAt the end of Insurgent, Tris and Tobias Eaton find a secret file containing a video of Edith. This video is what Tris has been trying to gain control of in Insurgent.DivergenceShe says that the Divergent are needed to fight a war outside the fence, and that they can help people on the outside. Later on they find out this information was only partially correct.