I don't know if you noticed, but both of her upper legs are pushed against something (the chair and her foot), and because of that I am very sure that this is not an unreachable physique. I have a similar build, with maybe slightly broader shoulders, but the waist to legs seems relatively normal when you also consider the arm that blocks part of the waist (which means that it's not as small as it might look at first glance) as well as the slight twist of the torso