I find it hard to believe that someone who is always so rude about fuller figured ladies (e.g. the 'size fat' dress) would have ever considered using larger models in her precious publication. By larger size she probably means size 10, not a 16.
I have a theory about that, it is nothing to do with being against super skinny models, it was probably Jone's own body issues, she would have hated it that in her job these much younger, much prettier and thinner models would have been par for the course, as such she was probably hoping that her quest to ban super skinnies would mean that the women coming in were more her size and she wouldn't be as jealous of them. But I totally agree that there's no way she would be campaigning for to ban very thin models, especially in light of her recent diatribe about having been bought a "size fat" dress which was in fact a 12 and is in no way fat (in fact looking at her she prob is a size 12)