Final answer:
The nurse should identify difficulty focusing during class as an indication of PTSD.
Step-by-step explanation:
The nurse should identify difficulty focusing during class as an indication that the child is experiencing Post-Traumatic Stress Disorder (PTSD). PTSD is an anxiety disorder that occurs after a person experiences a traumatic event. Difficulty focusing is a common symptom of PTSD, as the child may have intrusive thoughts or flashbacks related to the traumatic loss of their parent, making it hard to concentrate on schoolwork.