Does the death of the husband one month after his wife's supplication for his death due to a quarrel mean that her prayer was answered because she was wronged?

It cannot be definitively stated that the husband's death was a response to his wife's supplication, as knowledge of that rests with Allah. The supplication of the wronged person is generally answered, as the Prophet, peace and blessings be upon him, said: "There are three supplications that are answered without a doubt: the supplication of the wronged, the supplication of the traveler, and the supplication of a parent for their child." Narrated by Ibn Majah.

However, it is not permissible for the wronged person to exceed the bounds in supplicating against the oppressor, based on the Almighty’s saying: "So whoever has assaulted you, then assault him in the same way that he has assaulted you." If the supplication involves aggression, it will not be answered, as the Prophet, peace and blessings be upon him, said: "A servant will continue to be answered as long as he does not supplicate for a sin or for the severance of kinship ties." The woman should supplicate for her husband and forgive him.