Emily was The Joker's ex-girlfriend, she was angry with him for breaking up with her and finding a new girlfriend and even a wife, Harley Quinn, and with her he had a daughter, Lucy, who was 6 years old. She wanted to take revenge on him, so she kidnapped his daughter and locked her in the basement, she looked at girl and she laugh crazy

Emily:"This is your new home little girl , this is fault your daddy hahahaha"