First of all, the cause of death is just pure speculation, as no results of any medical examination are shown. They are just blaming the shots. She was obese, and may well have had a heart attack.
Yes, heart attacks can cause a purple or bluish coloring (cyanosis) of the face, lips, or skin
, a symptom of inadequate oxygen in the blood. This occurs because the heart may not be effectively pumping oxygen-rich blood, leading to a lack of oxygen circulating to the body's tissues. It's a sign of a serious underlying heart issue and requires immediate medical attention.
How it happens
Poor oxygen supply: During a heart attack, the heart may be unable to pump enough oxygen-rich blood throughout the body.
Cyanosis : When there isn't enough oxygen in the blood, the hemoglobin in the blood turns a bluer or purplish color. This makes the skin, lips, and face appear bluish or purple, a condition known as cyanosis.