What is the ruling regarding a wife who works as an English language supervisor and wears a niqab, going to a mixed-gender workplace with men, while her husband refuses to settle her deferred mahr?

A husband does not have the right to force his wife to work. He is obligated to provide for her maintenance in a reasonable manner. It is permissible for a woman to work, provided she adheres to Islamic regulations, such as covering herself and avoiding mixing with non-mahram men, except out of necessity, while also observing Islamic guidelines in speech. A woman's salary is her exclusive right. If the husband takes her money as a loan or a deposit, he must return it in full upon her request. If he invests it for her, the invested money is solely her right if the funding was entirely from her. If the husband participated with partial funding, then they are partners. If he withholds her right, she should discuss it with him gently to assert her right. Otherwise, she should resort to the Sharia courts.