Answer:
someone with savant syndrome.
Step-by-step explanation:
Savant syndrome: The term savant syndrome is a medical condition in which a person with notable mental disability determines few abilities more than average excess.
A person with savant syndrome is often referred to as savants and they mostly excel in things that are related to memory, for example, artistic ability, musical ability, rapid calculation, etc. A savant might be dealing with abnormality and can not do other things well but he or she can perform well in specific areas like music.
In the question above, Alexandra is someone with savant syndrome.