If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
She had cardiac arrest and they cooled her down to prevent organ damage. Now that I research it more, probably not enough to completely stop brain activity, though that was the premise of the question and they seemed to understand that part.
I've wondered if that sort of dramatic cooling is more of an optimal path to cryonic preservation than the current method of waiting for "natural" death and then immediate perfusion. E.g. since it's an official medical treatment, get cooled significantly "to prevent organ damage" and kept in that state until some measure of clinical death occurs, at which point it may be more likely to avoid ischemia.
I looked into cold-water drownings for similar reasons but it appears to me that what actually happens is just a preservation of oxygen i...