Mad Mary's daughter

Mary's daughter Gertruda is missing.
You have seen a painting of her and possess her doll.
You have told Mary you will look for her.
You gave Mary a special pie.
You heard from the keepers of the feather that Gertruda is in castle Ravenloft.
Gertruda seems to be very happy in the castle, she sees it to be like a fairy tale. She doesn't care that her mum is sad because she kept her locked up in her room like being locked up in a tower.
Gertruda appeared at Strahd's wedding. She has been turned.