Should a wife travel with her husband to study in the lands of the disbelievers for a worldly benefit, or not?

"I believe you should go with him, as that is closer to his safety from temptations. There is no harm upon her as long as she fulfills her obligation of covering herself and observing modesty. As for him going alone, there is fear for him, and she, too, if she remains without a husband, will be in misery."