This may seem like an odd question, but has your daughter gone to a chiropractor? Because of my muscle weakness problems, my muscles are constantly pulling my bones out of alignment. It got so bad, prior to the chiropractor, that I had a lot of vertigo. When I was in a car, I felt like cells of my body were being left behind and when we stopped they would run forward without my body. It was a horrible sensation.

Now that I get my back and neck realigned once a week, I usually only have a little vertigo or other related problems when I need an adjustment. After the adjustment the problem goes away for a few days.

I wonder if your daughter's disability might be playing havock on her muscles, bones, and nerves. That can magnify sensory problems a lot.

My balance has greatly improved since seeing the chiropractor. I still have problems when I have paralysis and weakness attacks (from my Hypokalemic Periodic Paralysis), but a good portion of the time now I can "fake" being a normal person when walking short distances. Long distances (more than 200 feet) are enough to trigger my disability through exhaustion.