From her story, she said her husband is a business man (dealing in importation/exportation of automobile parts) and when she was in the country, he didn't used to let her go out. So it seems she didn't really have anyone around her that will have made her doubt her husband.
When I was discussing with my mum, she said it is possible that the woman did not know what his real job was. That these robbers and kidnappers do not normally tell their wives and kids so they will not advise them against it. That it is very common in her side (igbo side) that you just know he is into business (most times importation) but you don't really know what exactly and you would never go to the supposed shop.
She should stop being sentimental tho. No one is going to jail her or her kids except any incriminating evidences are found to show that they were aware. She should allow the man pay for his sins abeg