EASY 10 POINTS!!!!!! HURRY!!!!!!!!?

ok in my book the main charecter gets injured and has to go to the hospital but nobody can know it was her who got hurt but she wants to get away from the people that took her there so how can she not tell anyone (I NEED IT TO BE REALISTIC not like they give her a magic potion or anything like that but is there a medicine that can make u forget what has happened or something like that?)