Go to another Doctor, even though she dosn't have any other troubles now dos not mean she wont. i'm 22 now, but at 20 they rushed me to the hospitial after i passed out, i had bad head achs that never went away, but i was also having sezuires, but never knew it, the people around me did, but the er doctor did a CT said i had a cycst, that i should see my family doctor, and sent me home. Your best bet is to see another doctor till they tell you what it is, sometimes you'll have to ask point blank. i hope all goes well and that she feels better. good luck