Is it permissible for a wife to take unemployment benefits while she is not working and staying at home, knowing that her husband is employed and well-off?

The reference for a wife's entitlement to a grant is the conditions and regulations of the granting entity. These must be adhered to without deception or trickery, for Allah Almighty says: "O you who have believed, fulfill [all] contracts," and the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions, except a condition that prohibits what is lawful or permits what is unlawful."