According to the original post, the woman had faded some years ago and not doing anything about the Witnesses. As I recall, the congregation are under no requirement to seek her out and disfellowship her. If they knew about her they would likely ignore it.
It is not favouritism, it is the way the system works. As for the family, I agree that some would decide to shun her but they are not obligated to. These people seem more loving and practical than some Witnesses are.