I've stayed out of this, but I will say one thing. My friend is exactly Dorthy's size except I'd say her boobs aren't as perky as DMs. She wears a size 9 in jeans/pants. She's built almost exactly the same. Muscular legs, round butt, small waist. I will say she weighs more than Dorthy states, but her boobs are bigger, too. Plus she's about 20 years older. She also fits into a size 6 or 8 dress.
I believe Dorthy is, indeed, a size 9. And she has no Mommy Tummy.
Dorthy, that last photo is quite perfect, by the way.
There is a great website where you can enter height, weight, etc and see photos of real women who fit those statistics.
http://www.mybodygallery.com