The husband is unfair in the rotation and maintenance. What can the wife do?

The wife has the right to raise it, ask for fairness and, if nothing changes, take a complaint to the religious affairs office or the Syariah Court.
Fairness in the rotation of nights and in maintenance is obligatory for a polygynous husband (4:3), even though equal inclination of the heart is not required (4:129). Start by discussing it calmly and specifically — note down dates and facts. If that fails, ask a trusted family member or a counsellor to intervene. The court can order maintenance, and under state enactments, unfair treatment of a wife can be an offence and, in certain circumstances, grounds for a fasakh claim. See Managing the rotation, Maintenance (nafkah) and Talaq & divorce.