From this lovely article, it appears that the heart disease factor was "arteriosclerotic vascular disease, a type of hardening of the arteries," which would result in impaired circulation (which would make the onset of hypothermia much faster) and very possibly in weakness or dizziness which would have prevented her from getting clothing out of her pack. Not a cardiac event, but a chronic condition. Assuming, of course, that the article is accurately reporting the autopsy report….

i wonder if she even knew she had this problem? So much heart disease among active, slender women is never diagnosed until the autopsy! It's fat ladies like me who get all the doctors' attention!