Quoting TantricLemons:" Yeah she has been checked out for it a bunch of times. Every new dr checks her out. We have tried lotions ... [snip!] ... in the past and nothing makes it better. We buy a special hyper-allergenic detergent to, its expensive as smurf >.<"
just a suggestion, because you know her best.
You might want to try Lush's dream cream. It' all natural, has things like calamine and lavender and is super gentle. I might not have been caught by the dr. and IF she is itchy, this will do the trick.
I have super sensitive skin and will dig at it when it flares up. The dream cream is the only over the counter thing that soothes it to the point where it doesn't bother me. Especially in the winter when my skin dries out and cracks (my knuckles bleed if I don't treat them.)
Like I said, It's worth a shot. I don't know anyone w/ sensory issues, so I'm not even going to claim that it is the issue, but I know I have had issues w/ digging at my skin and it's only because it constantly itches if I don't treat it properly.