Alzheimer's disease
She was studied by a doctor on staff named Alois Alzheimer (1864–1915).  Alzheimer became interested in her case because of her age; while the effects of senile dementia were known at the time, they usually did not start until a person was in their early to mid-sixties. Her case was also notable because of the rapid onset of dementia, only eight months, from the first reported symptoms, until she was committed.