You go to a friend's soccer game. during the game, she takes a hard fall and hits her head. the athletic trainer and the coach check her carefully. they decide she's o.k. to play. after the game, your friend wants you to ride with her to get something to eat. but something about the way she's acting doesn't seem right. you're worried that maybe she did hurt herself when she fell. and you definitely don't want her to drive. should you speak up and tell her you're worried about her? what should you say?