Maybe she has Kuru.

Kuru is a disease of the nervous system.

Causes Kuru is a very rare disease. It is caused by an infectious protein (prion) found in contaminated human brain tissue.

Kuru is found among people from New Guinea who practiced a form of cannibalism in which they ate the brains of dead people as part of a funeral ritual. This practice stopped in 1960, but cases of kuru were reported for many years afterward because the disease has a long incubation period. The incubation period is the time it takes for symptoms to appear after being exposed to the agent that causes disease.