Blunt trauma to the temple region causes damage that may not be proportional to the severity of injury. If you have not instilled any eye drops that cause pupillary dilatation, the irregular pupil sizes have to be evaluated. Any inequality and poor response to light checked by an ophthalmologist could also be due to increased intracranial pressure. Check the vision in her affected eye by covering her other eye. Taking into consideration the history of nausea along with trauma and pupil dilatation if present, I would recommend a consultation with an ophthalmologist where her retina will be evaluated to look at the optic nerve and rule out any swelling. If not, the exact cause of any pupillary inequality has to be determined.