Something does not seem right. Her head in this photo appears too big for the body.
We know she has a gigantic ego, so maybe the scale of the head is correct.
She most definitely has lost weight in the last few months. Especially around the hips and thighs.
I did a search for "Chelsea Clinton Variety Photoshopped" yesterday, and several sites raised the possibility/probability of "artistic license" taken by the magazine. Their graphic artist chopped a good 20 pounds off her posterior.
That's been airbrushed on steroids. That is not how she looks. Even if she had lost weight that's not what her figure naturally looks like.