She hasn't bought into anything. She didn't refute their relationship. She didn't argue that you were lying about the call. What's happened, is that her world has collapsed. Her husband is under investigation. He will probably lose his career. OR, he is the one who is e-mailing you back and it's his world that is collapsing. He has already thrown your wife under the bus. He has been ordered not to speak or contact her in any way. And your wife has probably disobeyed a direct order in trying to contact him. That is what I read into it.