When Elsa’s powers were exposed on the night of her coronation, Prince Hans was able to rally the people of Arendell behind himself and Anna, locking away Elsa, “for her own safety”. For a few months Hans worked behind the scenes to consolidate power, while Anna devoted most of her time to tying to help Elsa gain some control of her powers. It was only when her access to Elsa was suddenly restricted just as they started really making progress that she realized something might be wrong. On her way to confront Hans about it, she overheard him scheming to his two assistants to do away with Elsa after the wedding. Anna's entire understanding of the world came crashing down over night.