Therefore thus says Yahweh: 'Your wife shall be a prostitute in the city, and your sons and your daughters shall fall by the sword, and your land shall be divided by line; and you yourself shall die in a land that is unclean, and Israel shall surely be led away captive out of his land.'"
It is not necessary to assume that Amaziah's wife willingly became a harlot of the city, although some have assumed that she did.  What seems more likely is that, violated by the soldiers of Assyria, and left behind with the residue of the people after the deportation, she could have had no other means of sustenance.