The main search box is disabled, as Thud mentioned, click on advanced search right below it.
Also scroll through the General Health forum.

I would suggest rather than just lowering gluten, your DD eliminate all wheat, grains, etc. Many success stories using Wheat Belly. All his books explain why full removal of grains, and not just use gluten-free products, is needed.
http://www.wheatbellyblog.com/?s=Migraine
The difference in its LC rules from Atkins is small but the never re-introduce grains rule important. Allows more net carbs too.

Welcome