It might be helpful to take your daughter to a nuerologist or headache specialist to get the best diagnosis of what is going on with her. It does sound like a migraine, and it is possible for a 14 year old to have them. I have had them since I was 7 or 8. My migraines are affected by my hormones (like when I get my period). Maybe her hormones are changing and it is affecting you her headaches.