Severe Headaches After Sinus Surgery, What's Going On?

My daughter had a broken nose repaired, her septum fixed and polyups removed from her nose 6 months ago. She is having severe headaches every day. Her surgeon & family doctor told her they don't think it's normal but she had a lot done. She also had they nasal passage widened. (sorry don't know all the medical terms) Is there some way to find out what's wrong. She is in terrible pain. The doctors don't seem to worried about it.