In Chapter 5, why did Dr. Alex M. Spektor wonder if Mary had ever been tested?

Dr. Alex M. Spektor never saw any sign that Mary had a learning disability or was hyperactive or impulsive. School records showed no disruptions or violence in the classroom. Every progress report highlighted her attentiveness, thoughtfulness, and ability to follow directions. During her residency, she demonstrated cognitive awareness, a sharp memory and follow-through of tasks given, which made him wonder if she had ever been tested for a learning disorder or hyperactivity.