What is the ruling of Islamic law regarding a wife who demands that her husband divorce his second wife, and stipulates that he stay with her for three days in exchange for one day with the second wife? And what is your advice to the wronged wife?

A wife's attempt to seek the divorce of her sister (co-wife) is forbidden and angers Allah. It is considered a manifestation of stinginess and ill-faith in Allah, for the Prophet, peace and blessings be upon him, said: "It is not lawful for a woman to ask for the divorce of her sister so that she may empty her plate, for she will only have what has been decreed for her." Similarly, a wife's attempt to harm her husband or co-wife is forbidden. It is incumbent upon the husband to be just between his wives, and a wife should not escalate her relationship with her husband to the point of "either me or her." The wise person strives to achieve the better of two good things, and a wife remaining with a husband who loves her is better than her seeking a divorce.