The author of this article can not know any of those answers and neither can anybody else because MS will not release her medical records.
Like you, I've been cathed numerous times. I am also pretty conversant in the anatomy of the heart, though I am not a Doctor or a nurse, because I have spent my career installing, repairing and instucting cardiologists and technicinas on there proper use and abuse.
It's obvious that her heart stopped beating for from 6-8 minutes because she suffered a lot of brain damage. I'd be interested in why it stopped beating. I'd be even more interested in why MS did not call 911.
From articles I've read it appears that he call two family members first, but it appears that he did call 911 in time to get medical attention for her within 6-8 minutes.
When I had my first heart attack, my wife called a relative (who's an MD) before taking me to the ER and never did call 911. However, I would say that my wife strangled me because of these actions.