OK, now I understand the point of our disagreement. I think her weight is pretty normal for her age and genes; you think that any woman with her build is not eating properly.
I guess we’ll never know the actual facts until she starts talking about it. Looks like she’ll have to.
It probably is normal for her age, at least in the US -- but is it healthy? As an example, hypertension is normal in 80-year-olds, but it's not a healthful condition. I agree with you that the best thing for her to do is discuss her weight publicly. It could encourage others with similar problems.