my 13 year old grand daughter passed out during basketball practice, had not eaten that day and episode happened at 1pm, hit her head, has no memory of episode, blood pressure 1 &1/2 hr later was 100/72, seems fine now. she had been "spotting" but got her first period with in 42 hours of the episode. do you think not haveing eaten or starting her period may have been the cause of this happening?