In my opinion. I think Elsa as a Queen of Arendale should prepared something for Arendale safety of what happens in a future. We never know if Arendale will be peace all day long. They should prepared some trap for the enemy that attack Arendale. In that case we can sure that Arendale in a safe place. Next, we should not trust people so easily. Like Anna trust Hans for the second time by saving her from Vikings and falling in love with Hans. Anna did not know what Hans plans to do a bad thing on her. Besides that, Anna showed her love on Elsa by worrying Elsa climbing up in a mountain that might be danger on her. Anna fall a tears when she saw the palace of ice crumbled to the ground with Elsa inside. That she feels her sister, Elsa was truly dead.