Thanks for writing your query.
and nausea can be due to concussion
. Stomach pain and diarrhoea
are not due to concussion.
You have not mentioned whether she was put on some medications during her visit to ER. It might be a possiblity that she must have been given some pain killers. Pain killers increase the acidity in the stomach which can cause the symptoms mentioned by you. You can give her antacid like Omeprazole
20 mg once a day to decrease the abdominal symptoms, after discussing with her treating doctor.
You should get a scan of her head done to rule out any internal injury.
Also get her examined by a ENT specialist
to examine for assess the cause of pressure in her ears.
I hope this is helpful to you.