So Gretha knew that if she tried to escape from Han, she would run into monsters that were far stronger than her.
That is why Gretha decided to stay in the inn whenever Han leaves. She still believed that Han was in love with her so she was sure that he would protect her from any kind of danger out there! Gretha first thought about using Han as a pawn to do whatever she wanted, she always heard that men in love were easy to manipulate. And if she can manipulate someone as strong as Han she can conquer the entire world! But recently she has been having second thoughts.