It may be a classic case of Shoneys Addiction. Maybe she loved to hit every Shoneys within a 50 mile radius.In her case I would suspect Polycystic Ovarian Syndrome, very poorly treated. Or poorly adhered to treatment by her. Not only the obesity and inflated face, but also thinning hair. But I'm not a medical professional by any means.
Legit women with PCOS can put on a lot of weight and have a very very very hard time taking it off.