A machine is beating her heart for her. A ventilator is supplying oxygen to the blood, which is being mechanically pumped. Unfortunately because the brain is no longer functioning, the other organs aren’t being “told” what to do by the brain. Eventually the organs will decay like her brain. Let’s not forget that the skin is an organ.
Show me where it has been stated by a reputable source that “a machine is beating her heart for her”.
You don’t know what you are talking about.
A ventilator pushes oxygen into the lungs at certain prescribed rates and pressures. The lungs(as long as they are perfused by a beating heart) perform the actual gas exchange of oxygen/CO2. A ventilator only does the mechanical act of moving air in and out. The body does the rest.