Q. Does a wife need her husband’s permission to changing her Madhab?
A. When a person follows a Madhab, he/she must believe that his/her Madhab is correct though it has the possibility of being wrong while the other Madhaheeb are wrong but they may have the possibility of being true. So what wrong did you find in the Madhab that you are following? If you do not get any authentic proof against the Madhab you are following, it is not permitted for you to change that Madhab and follow the other one that you used to consider wrong, even if your husband asks you to change the Madhab. (Raddul Mukhataar Ala Durril-Mukhtaar: 1\48)