Fulfillment of a prophecy that contains a transgression

In the SD
Hello Rabbi,
Question regarding Parashat Shavua: There is a famous disagreement between Maimonides and Ramban regarding the question of why the Egyptians were punished for enslaving the Israelites, since God decreed that there would be enslaving. Maimonides’ opinion is that because they “volunteered” to do so and God did not specifically command them to do so, they were punished, and the Ramban’s opinion is that although there is a commandment to volunteer to fulfill God’s prophecy, since they added more than was necessary and did not do so for the sake of Heaven, they were punished.
I would like to ask, according to their opinion, from the prophecy given in the Book of Amos (7:17), where the prophet Amos prophesies to Amzia: “Therefore thus says the Lord: Your wife will commit fornication in the city, and your sons and daughters will fall by the sword,” to Achur, is there a commandment for a wife to fulfill the will of the Lord and to commit fornication under her husband, for the sake of God (assuming that she knows about this prophecy)?! Even for the Rambam, here it is known about whom the prophecy was spoken, and since for the Rambam there is a commandment for everyone to go and fulfill the will of the Lord, apparently she should do so. Is there a difference?