Is there a minimum speed posted on that road or in a law book somewhere? If so, she is wasting her time. If not, then she has a point although not very smart actions on and off the road.

If a cop drives up on me and bullhorns me with "Get on the shoulder", I just get on the shoulder for a while. Even if the shoulder is trashed. I have better things to do with my time and money than jerking around with some Podunk legal system. My sense of personal pride in this regard is fairly miniscule.