Ummm...actually, my mom looked like that for a good part of her life. I don't find it scary, just non-attractive. It may be something she can't help, my mom wasn't able to, either, no matter how much she ate, she could NOT gain weight. (Yes. Sometimes that can be as bad as not being able to lose weight.)
I used to be unable to gain weight. Then my metabolism slowed down with a vengeance, after my heart didn't have to work so hard just to get blood into itself. Now I have padding. Annie's also lost a lot of weight since 1990: she wasn't THAT skinny a decade ago.