How about this: The adoptive parents can keep the child if they pay the woman for all of the money wasted between birth and kidnapping (including hospital bills for the birth).
Since the mother only had the child for two years, she doesn't have nearly as much attachment to the child as the current parents do, so some monetary compensation should make up for it since she could just have another child.
Since the mother only had the child for two years, she doesn't have nearly as much attachment to the child as the current parents do, so some monetary compensation should make up for it since she could just have another child.