The school is probably going on the teacher's perception that it is not a writing skill deficit, but a performance deficit, in which case the primary issue would be anxiety. This is, of course, not necessarily the case. I would agree that a comprehensive eval (even a school-based eval, with some emotional assessment included) makes more sense than attempting to look at one piece at a time. We're not allowed to diagnose anxiety disorders in the schools, so it may be that the school wants an outside licensed person to make the anxiety diagnosis.
