As someone who was once an NREMT-B in the US, we were taught that someone isn't dead, until they're cold dead. I haven't read the article yet, but I assume they kept her warm.
Not sure about that. People whose heart and lungs have stopped may survive longer if they're cold. At least that's what I heard relating to a case of a boy who was revived after spending a long time under the ice of a frozen lake/river.