Yes, she appears short waisted, or high waisted as you say. The belts aren’t helping her and that ungodly neckline on the outfit from today is terrible, looks like it simply doesn’t fit her at all.
Using her height to her advantage would be smart, she’s long-legged enough. These outfits pictured actually make her look a bit porky and her stance is best described as ungainly-looking or awkward.
I’m certain she’ll get better at dressing. I recall First Lady Laura used to wear bows on her evening dresses in the early years that didn’t flatter her either. Still, Laura’s natural grace came through and Mrs. Obama will have her work cut out in portraying anything resembling that.
And we, on the Dose, used to comment about them, saying they were not flattering, in the least. But most of the time, her outfits were quite lovely, and suited her well.