Remember she has a public image to keep up. It's easier to look good if you had a trainer, plastic surgeon, dietitian, chef, etc (I'm not saying KG in particular, but people that are under the public eye in general).
In regards to her breasts, plastic surgeons will create the drop, to mimic the natural process. Many women prefer that instead of the "high profile" look. I have seen many done in surgery, so it's not pure speculation, I have also seen my share of chests. To me she looks like she had some work done, but that's just my opinion.
I think she is doing a good job with her diet and exercise! Very disciplined, and that comes from someone that's not a fan!