What Does Concussion With Black Outs In Players Suggest?

hi my daughter is 18 years old and is a avid hockey player. she has had several concussions and recently blacked out during a scrimmage a little over a week ago. she did not appear to be concussed however, she just flew out to boston from mn for a tournament. she had a collision on the ice and is now experiencing concussion like symptoms (but is refusing to see a dr. there). would you redcommend a ct scan? also not sure if she should fly home. any suggestions?