I think you should try to find a headache specialist or neurologist at this point

I had a headache just above the forehead (frontal lobe area) for the first time last? week and it was weird.  I've not determined the exact cause but believe it had something to do with using an antihistamine in combination with other meds or situations.  Finally it went away when I took more of the antihistamine!

Is she using antihistamines? I always would get a migraine if I forgot to take Claritin (3hrs or so after when I should), so I changed to another type of antihistamine, a generic antihistamine, hydroxzine.  Zyrtec may be similar, as an OTC antihistamine.

With this headache, I first tried my other headache remedies, such as caffeine or a portion of my migraine med - neither helped.  Then I realized that I had not taken my antihistamine.  While this happened before with hydroxzine, I had never before experienced a headache. But this situation may have been different.  I was at the end of my cycle, when women often can get a headache. And maybe the timing was bad to forget to take this type of antihistamine.

It is very important to keep a food diary.  That's how I discovered I get headaches from alcoholic drinks, gluten(wheat, rye, oats, barley), annatto (a natural food coloring), caramel coloring and flavoring, etc.  Those often started between the eyes or the area of the forehead, and my sinus doctor assumed it was an allergy issue.  She sent me to an allergist, which did not test for food allergies!  I didn't know better at the time.  Headaches continued because I kept eating gluten, my worst enemy.

When I was getting headaches EVERY day, it was because I was using headache remedies every day - the rebound effect.  A neurologist pointed that out to me. 

Still, none of the doctors determined my cause and I figured it out after tracking food and activities, etc.  None of them advised me to keep a food diary either.  If you start a food diary, start eating only the most natual foods for a couple of weeks - NOTHING processed (no soups, no sandwich meats).  Then, add new items each day, etc.

I've learned that the female cycle makes me more susceptible to the food reactions, and maybe the antihistamines too.  I found the week prior to my cycle, first day, last day and then another day in mid-month easily triggered headaches/migraines with certain foods and situations.  Tracking every thing will give you clues to your situation.  There isn't an easy answer.

I was surprised to read that the neurologist you saw determined it was a tension headache in one meeting and suggested more headache medications!  Most people I know that ever had tension headaches, including myself, usually have tight muscles at the back of the head.  The headache can go up and across the top of the head to the front, but it usually starts at the back.  That can happen from poor posture or sleeping positions, not only stress. Others have told me their tension headaches are in the sides/temple area.  These can ease up on their own if the situation that causes it goes away.  In stress-related tension headaches, I went to a massage therapist for a couple of times.  The advice about seeking someone other than a neurologist is good advice.  Headache specialists are not easy to find.

I hope your daughter feels better soon.