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"Grandmother" is more important than all of those other things, because of the whole "old+frail" thing usually makes people not participate in ironman challenges, at least where I live, and none of those other things implies anything of the sort.
Not everything is a scientific journal, and people with hearts like "feel good stories", even the stories with a bit of flowery language to really drive home some of the points. It's OK.
There's also a good chance, since she was interviewed, that that's how she described herself first.
"Tell me about yourself."
"Well, I'm a grandmother..."