If she is raped, stone her as an adulterer.
I agree that such laws are unkind and unjust. Did we sign up to bring "justice" to their oppressed minorities? Even our country has a hard time accepting those who reject our fundamental beliefs and yet live among us. We lock up polygamists, prostitutes, people who possess forbidden plants, etc. At Waco, we addressed a tax issue. Why can they not have a law that enforces the widely held values and religious beliefs of their people?