Answer: Multiple sclerosis
Explanation:
Multiple sclerosis is defined as the disease that occurs suddenly in a person's central nervous system.It does not let communication take place between body and brain by restricting information flow. Impairment in coronation, loss of vision, severe headaches and other cognitive problems are faced by a person as symptoms.
According to the question, Karen might be suffering from multiple sclerosis as diagnosis report as she is facing partial vision loss, improper information in terms of words and cannot coordinate properly.