Cindy McCain says she'll never release her tax returns - AP report?

Yes she should release her tax returns. She may not be running for office but her husband is, and if she is his spouse then she is going to have some influence in his cabinet. Why not release them? What is she hiding? I don't even like Hillary but she even finally released hers...why doesn't Cindy? What is she hiding??? I mean we already know that she's the conservative 'beer baroness'.