What is the significance of the name "MYOP" in The Flowers?

I think the previous answerer meant to say Myopia, which is the medical name for nearsightedness. However, Myopathy, which is a muscular disease, fits the character as well. The National Institute of Neurological Disorders and Stroke defines myopathy as a neuromuscular disorder

in which the primary symptom is muscle weakness due to dysfunction of muscle fiber. Other symptoms of myopathy can include include muscle cramps, stiffness, and spasm.

Ordinarily when a 10-year-old child--or a person of any age--not just discovers a dead body but actually steps on it, the response would be horror. We expect her to run screaming to tell someone. Myop, however, just reaches down to pull her shoe out of the man's head, as if her reactions are dysfunctional. She even continues to pick flowers. The only thing that seems to move her is the sight of the noose around the dead man's neck.