What is the ruling of Islamic law regarding how to deal with a wife who refuses her husband's advice concerning adherence to Islamic guidelines in dress and interaction, and who curses him and threatens him with separation, while the husband is aware of his love for her and the difficulty of separation both financially and psychologically?

What the wife does by appearing adorned in mixed-gender places is forbidden (haram) and an act of disobedience (nushooz). She must be reminded of Allah and the impermissibility of tabarruj (displaying adornment) and sufoor (unveiling). Seeking help from righteous companions is also advisable. If she insists on her tabarruj and sufoor, divorcing her is preferable, because it is not recommended to keep a wife who is negligent in Allah's rights and disobedient.