Hi,
Have you gotten her teeth checked out to see if her bite is off in her mouth, I had headaches since the age of 13 I am 23 now and it was do to TMJ. Look at the tmj bpard it may be helpful! How is her pain and how long does the pain last? Is it everyday? You need to pinpoint what type of pain it is and maybe you can research it online.
Good luck in finding out what it is
Take care,
Starr