What is the ruling on a husband making his wife's life difficult so that she fully forfeits her Mahr after her repeated exits from the marital home without his permission and her desire for separation?

If the wife leaves her home without a valid excuse and asks for divorce unjustly, the husband may refuse to divorce her until she forfeits her dower or part of it. This is known as "al-adl" (hindering/coercing). It is recommended that an arbiter from the husband's family and an arbiter from the wife's family intervene to reconcile them, or to agree on divorce if reconciliation is not possible.