During oral presentations it emerged that she had taken advantage of the opportunities for family member employment overseas while being the spouse of a member of Embassy London's Administrative and Technical staff. At least, that's what I'm taking away from the news media's coverage, scattered and unreliable as it is.
That is to say, she was simultaneously an appointment eligible family member, able to work for the embassy in her own right, and also a just-plain family member of someone with diplomatic immunity. That's not a hard concept to grasp, or so you might think.
There are many ways for the U.S. government's family members to find employment abroad, and good for them. What would the State Department do without them?
Now for the question of the day: did her employment as an eligible family member negate that family member status which conveyed her spouse's diplomatic immunity to her? That's what the Dunn family spokesman / ringmaster is telling the news media, and they respond like seals clapping when someone tosses them a fish.
But, is it true?
As someone with internet access and the ability to form questions, I looked here - a publicly available source of information - and found this answer:
Family members of administrative and technical staff assigned to an embassy have full criminal immunity, testimonial immunity, and inviolability. However, they have no civil immunity ... Many foreign states will not permit a family member with diplomatic status to work unless the diplomatic status is waived. The important thing to note is that the right to waive immunity belongs to the U.S. Government; no one has a right to waive his/her own diplomatic immunity. Under the Vienna Convention rules, family members who are employed on the local economy may request the post to waive their civil or administrative immunity with respect to their employment; however, criminal immunity is preserved in every case.
So, despite the chills and trills currently running through the UK and some U.S. media, the matter of eligible family member employment is not the gamechanger they would wish. The American driver had criminal immunity as the family member of an A and T staff employee, as has long been confirmed by the UK Foreign Office and been re-affirmed by the UK High Court. Nothing about that changes.