What are the legal implications for the wife, in terms of mahr, maintenance, and 'iddah, and what are her obligations, if she requests a divorce due to harm caused by her husband's abandonment and refusal to financially support her?

It is advisable to be patient and gentle with the husband, but if the wife is harmed, she may take the matter to the Sharia court. A woman is permitted to seek divorce due to harm caused by the husband's failure to provide maintenance. If the harm is proven and the judge rules for separation, she is entitled to the full dowry if cohabitation has occurred, as Allah Almighty says: "Divorce is twice. Then, either keep [her] in kindness or release [her] with good treatment. And it is not lawful for you to take anything of what you have given them, unless both fear that they will not be able to keep [within] the limits of Allah. But if you fear that they will not be able to keep [within] the limits of Allah, then there is no blame upon either of them concerning that by which she ransoms herself. These are the limits of Allah, so do not transgress them. And whoever transgresses the limits of Allah - it is those who are the wrongdoers." [Al-Baqarah: 229], and as the Prophet (peace be upon him) said: "If he has cohabited with her, then she is entitled to the dowry for what he has made lawful of her private parts." As for the waiting period ('iddah), it is obligatory according to her condition (pregnant, non-pregnant, young, old), and she is not entitled to housing and maintenance unless she is pregnant, because a judicial divorce is an irrevocable divorce (ba'in).