I've had migraines since I was 16, and I even had to switch brands of birth control pills because the first one triggered them. I get them on occasion, and my triggers are too much red wine(more than 2 glasses), too little sleep, and hot, humid weather. For me, Excedrine Migraine works, but as it has asprin, the best thing for your daughter is to have her see the doctor, who may refer her to a neurologist.
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"I do not feel obliged to believe that the same God who has endowed us with sense, reason,
and intellect has intended us to forgo their use."
- Galileo Galilei