A puuzling probable peripheral neuropathy mystery.

In today’s G2 section of ‘The Guardian’ in the UK is a very interesting health article. Has anyone a suggestion to make re this mystery?
The article is headed: ‘If no one knows what’s wrong with her, how can she get better?’

Four-year-old Elysha Robertson has had a mystery illness for two years. Vicky Frost talks to her parents about living without a diagnosis.
The whole article is to be found at (Link deleted by Administration)

Part of the article includes:”There were tests at Aberdeen, the family’s local hospital, and further tests at Edinburgh before Elysha was discharged. It was thought she might have Guillain-Barré syndrome, a rare condition where the immune system attacks the nervous system, but everything came back negative. Two weeks later, Grace took Elysha, and her seven-year-old sister Shannah to visit her parents in Rotherham, near Sheffield.
Again, Elysha had to be taken to hospital; again tests were inconclusive. “They diagnosed a rare form of spinal muscular atrophy (SMA),” says Grace. “But we looked into it and it just didn’t make any sense.” Tests came back negative. Still nobody knew what was wrong.”
And much more.
Please read. If any thoughts please post. 🙂