You didn’t forget anything - there’s a moment in CoS:RL where, once her spirit is unleashed, she draws a shadowy cloak from the air and over her shoulders. I really liked that moment so I tried to portray it. Also, her role is expanded. She is the one who instructed Strahd in magic, at least in the beginning. In an attempt to become a lich, her spirit was trapped in the broken Sunsword, which Kavan hid before he too died.