showing normal is a good thing. Serial CT scan could be done later in case a gradual intracranial lesion has developed. Now depending on the degree of concussion
it might not be necessary to request another CT. Headache and nausea might just be occurring temporary since she had a head trauma
. Just get him some analgesic
pain killers for the headache. If the symptoms persist you can get an CT scan or MRI better still.
She should continue the rest and analgesic pain killers for a while.
Hope this helped