This is now 2016 but I had these issues and it ended up being mold in my walls. A lot of people think you need to see mold, but in small amounts mold spors are translucent and odorless. You only see them when they get really bad, but once you see them that means they are everywhere, and contrary to popular belief you can not clean mold. You have to remove whatever it's on completely. Again i couldnt see mine, but i had to sell my house and it followed me, come to find out my furniture, shoes, clothes, even electronics, everything I owned was contaminated with mold. I had to get rid of everything. If you cant summerge a moldy item in boiling water then you cant save it. I had every symtom from every sickness and i was in and out of the hospital for two years. I went from not being allergic to anything to literrally being allergic to everything. The doctors couldn't find anything wrong with me so they just said I had bad allergies but none of the medicine worked at all. Now I think I've got a hold of my issues, and Ive helped several people, hope to help others.
hi! my fiance has been having the same symptoms as your friend's daughter. sorry to tell you but until now, we are also in limbo. the doctors have suggested and treated him for allergies, asthma and acid reflux but nothing works.
good luck on our quest to find the answers!