Of course, she should only receive medical advice from a physician.
I personally have a good one - a cardiologist who takes great pains with patients to avoid having to use one of the skills he is trained for - stent surgeries.
I can't help but think this woman would be better to prioritize diet over exercise. My doc really works on changing diet, including avoiding the incredible amount of carbs and sugars in processed foods. This all sounds tried and true, until, of course, one faces the prospect of real health problems, including, as is often the case, diabetes and heart disease. The reality is that for many of us eating properly is far more difficult than slugging through a training run each day. But in my 50's, I think diet takes priority over exercise (although I do that too, with an emphasis on enjoying it more than I did in my competitive days).
This does not mean she cannot be active. But on a true weight loss program, diet for most is far more significant than exercise (although light consistent exercise is of course desirable). Rigorous exercise should come later - and should be done with an eye towards still eating responsibly (and avoiding huge carb intake).
I don't deign to diminish her accomplishments in making the effort. But I am wary of conflating her attempts at exercise with living healthy.