My only issue is 1,700 calories. I can't fathom how she get's that look at such an amount, unless that a contest diet amount. If that was someone 40 years younger, they'd be eating about 3,000 at least, probably 3,500 maybe more, unless the figure of 1,700 is a typo perhaps.
I'm not insinuating anything about her, but I just can't quite get my head around that caloric figure, as most people wouldn't get anywhere much on that and running marathons, you'd need more than 1,700, plus she's doing both marathons and bodybuilding, the two don't naturally work together, because the way you train for Marathons, would seriously hinder bodybuling in most cases.
I saw something like this about 15 years ago. An American woman around 75, was winning powerlifting titles, but I forget her name.