If your son's life really depends on getting treatment in the U.S., as a mother she should absofreakinglutely allow you to bring him on your own to get treated. It's absurd to think that you would allow your son to suffer because you and your wife don't seem to think you're capable of caring for him. If it's really that urgent, you should do everything in your power to help him, even if it means his mom can't come with him. And even with the strongest of ties to Morocco, the chances of her getting a B2 are slim to none. You're attacking the people who you came to asking for help, if you don't want to listen, that's you're prerogative BUT don't bite the hand that feeds you. Just saying'.