Wa `alaikum as-salam

If it is not necessary for her health, she should not disobey her husband, since the husband has the right to give permission for his wife to go out of her home. According to the report of Ibn `Umar, the Prophet said, “If your women ask permission to go to the mosque at night, allow them.” (Al-Bukhari)

Based on this hadith, scholars concluded that, the husband has the right of giving his wife the permission to go outside. In case she must go out for medication or because she is afraid that her disease will increase or it may lead to an apparent deterioration of her health, she can go.