(((AAAAA and daughter))) - firstly, you're certainly not stupid. I know you're a devoted mother like I am and we pride ourselves, with being in tune to our kids...but we don't have all the answers, so don't blame yourself for not knowing. I'm sorry your daughters had migraines for so long - this must be awful. Some people are plagued with migraines and they don't know why they get them. They also run in families sometimes too, so people don't look for a root cause because I don't think the medical profession knows enough about migraines.
Has your daughter had a CAT scan? I'm sure this question about head trauma, has opened up these bad memories for you. This is one of the reasons my daughter and I decided she should stop karate classes. Her instructor was too pushy with contact sparring and I was concerned with the head jarring. Doctors now know, that minor concussions during sports, can cause accumulative damage. Did the neurologist give any treatment options or tests?