I don't think she was doing anything wrong. But, as mentioned, intersections could be bad.

There is a spot on my commute where, on the way home, I have about a 1/2 mile where the road is 50mph and pretty busy. There is a narrow grassy area beside the road, and I choose to ride that instead. I do it on the right side of the road, but only because that seems to work better. And I only go from one intersection to the next intersection.