In both cases, he's working with the face and bite the person already starts with. In the case you don't like, she starts with a very high slope to the jaw line (her jaw angle is up high close to her ear). So, that did not change significantly with the surgery, nor could it be expected to. In the case you do like, she STARTS with a short lower 1/3rd of the face and her jaw angle is LOWER on her face (further down from the ear). So, adding MORE length to her face (and projection) made her look better.
Basically, OUTCOMES are a FUNCTION of STARTING POINTS. So, if you start with a back jaw angle very high towards the ear; a very HIGH 'slope' to the jaw line which is something that contributes to apparent 'length' to the face, you can't expect to have an outcome similar to someone with a short face who has a jaw angle LOWER on the face who looks better because she also NEEDED MORE length to the face.