Why is Mrs.Medlock unhappy about having to take Mary to Yorkshire?

Mrs. Medlock is unhappy about taking Mary to Yorkshire because she finds the task burdensome and is not fond of the idea of dealing with a difficult child like Mary. She views the journey to Misselthwaite Manor as an inconvenience and is concerned about the challenges that come with caring for Mary, who has a spoiled and unpleasant demeanor. Additionally, the remote and gloomy setting of Yorkshire contrasts sharply with her expectations, further contributing to her dissatisfaction.