Is it permissible for a woman to count a portion of what she spends on herself and her household as zakat al-mal and expiation for fasting and oaths, given that her husband has ceased to provide for her despite his affluence, and claims that her own wealth suffices her from his expenditure?

The wife's maintenance, clothing, and housing are obligatory upon the husband, even if the wife is wealthy. If the husband does not treat his wives equally in maintenance, clothing, and turns, he must repent and be just between them, unless one of them waives her right. It is not permissible to count Zakat al-Mal (charity on wealth) among what a woman spends on herself and her home, because these expenses are obligatory upon the husband. Zakat is for the poor and needy.