DMy 22 Year Old Daughter Suffered A Concussion Last Tuesday

DMy 22 year old daughter suffered a concussion last Tuesday by raising her head after brushing her teeth and hitting the top of her head on an open cabinet. She went to work but got worse by afternoon. CT scan showed a concussions. I've noticed dark circles. Is this normal? She has little memory of this whole incidents. My concern is, how should she be taking care of herself. She seems to think she can function as normal. We are in different states