Has she killed off the Echnida/Ahriman/2 headed dragon/cerberus bosses yet? Without killing off those, beating the Cloud of Darkness is pretty much impossible. Other then that, I hope that you brought enough healing items and stuff with you, because she can hit for a lot of damage. Keep your White mage alive at all costs, and have him healing your party the whole time. Have your summoner use Bahamut every turn. Your knight and thief should be doing as much damage as possible. If possible, try to get your thief to a different class, as it is tough to keep him alive under the CoD's attacks and there are other classes that can deal out the damage in a more efficent manner.
Best of luck to your wife!
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