It's entirely possible training has extended her life already.

Boring example but an obese woman with type II diabetes her age might already have had one life-threatening fall, may already have other severe health challenges.

Whereas a woman her age with such good vascular health could be delaying the onset of significant vascular dementia by up to a decade, let alone all the other things.

Still, the point I was making is that it is not shortening her life; it's either having no statistical difference or extending it.