Emma has multiple sclerosis. if you could view her nervoussystem you would find

a lack of neurotransmittersin some neurons
areas where the myelin sheathhas degenerated
areas where the dendrites areseverely damaged
a reduction in the number ofchloride ions in her peripheral nervous system

Areas where the myelin sheath has degenerated

Explanation:

Multiple sclerosis is a disease of the nervous system where the myelin sheath is damaged, and impairs its ability of conducing signals in the affected nerves, causing serious deficiencies in many life aspects (movements, sensations, cognition etc).