Gladys was born April 25th in 1912, she was 46 when she died.
It's been said she died from a heart attack brought on by complications of Hepatitis.
Elvis had two liver biopsy's to check for hepatitis. One in 1973 and one in 1975 .Neither showed hepititis to my knowledge.
I believe it was hard on her to be seperated from her son as he grew more famous. She worried about him. Parents tend to do that .