Jamieson, Fausset and Brown on 1 Kings 14:2

2. Jeroboam said to his wife, Arise, I pray thee, and disguise thyself--His natural and intense anxiety as a parent is here seen, blended with the deep and artful policy of an apostate king. The reason of this extreme caution was an unwillingness to acknowledge that he looked for information as to the future, not to his idols, but to the true God; and a fear that this step, if publicly known, might endanger the stability of his whole political system; and a strong impression that Ahijah, who was greatly offended with him, would, if consulted openly by his queen, either insult or refuse to receive her. For these reasons he selected his wife, as, in every view, the most proper for such a secret and confidential errand, but recommended her to assume the garb and manner of a peasant woman. Strange infatuation, to suppose that the God who could reveal futurity could not penetrate a flimsy disguise!