Just because bones are strong doesn't mean they're unchangeable. If you were to watch a bone develop over the course of a lifetime sped up to a few minutes, they would look very squishy. For 95% of human existence, they hunted and gathered. I don't think anyone could get this fat, because the more you ate the less you could produce, keeping you healthy. The physical activity and hard food that they could only cut with their jaws made these humans exert an incredible amount of force on their jaws over a lifetime, and widen their airways. This woman probably does neither of these things. So her face is not designed to develop to become beautiful under these conditions, just as her heart is not designed to function. Some research has been done proving that breathing through your mouth hurts your appearance. And will you look at that, she's doing it.