“DNA from Elvis’ hair suggests he suffered from a genetic heart muscle disease, hypertrophic cardiomyopathy.”
https://www.mirror.co.uk/tv/tv-news/elvis-death-shocking-new-dna-3280460
Yes she could have inherited this condition.
He also had an autoimmune disease. And I suspect if you ran his DNA you would find he had some variants for addiction
Elvis was at least 260 pounds at his death and on all kinds of drugs hard on the heart.