my friend who's 47 fell off a horse 10 days ago and was unconscious for several hours. she was on morphine for two days, suffered from acute headaches for 5 days, remembers nothing for the first four days and is currently sleeping 18 hours a day. her mri and ct showed nothing serious. they were performed four days following the accident. on thursday, just 13 days after the accident, she plans on flying from hawaii to the east coast and all around the east coast for two weeks. is this a safe thing to do at this point in her recovery? if not, what dangers is she facing?