For your no-war story you could have Tris get nearly killed and its Tobias who saves her, because Uri is at a business meeting that Tris couldn't go to because of the baby. Tris didn't get mad at Tobias because so was so scared for her life.
It's bad but here's an idea. Can you also read my fan fic 'This.Is.Real'? If you get ideas you could use those too.