Hi and welcome to HCM,thank you for your query.
i am not sure how fatty liver
was diagnosed in her case. Enlarged liver is usually normal finding in this age and it doesnt indicate anything.but you should do liver functional tests to confirm this. Of course, there are some liver disorder which may be found at her age but this is the last thing to think of. more commonly this is normal or it can be sign of any mild infection.
Wish you good health. Regards.