I need some advice. On Monday my daughters flyer kneed my daughter in the face which sent her backwards and slammed her head in the mat. Since then she’s had a headache and nausea. The headache has not gotten worse but it is not relieved with any pain medication. Besides that and the nausea she doesn’t have any other symptoms. Could this still be a concussion?? I’ve tried researching online but she hasn’t had any dizziness or issues with coordination. So I’m unsure.