She is an old lady who is morbidly obese. She may be diabetic. Her concussion from her fall several years ago was bad enough to damage her eyesight thus the glasses with the fresnel lenses to correct double vision. She is imho seriously unhealthy.
Hillary's dilapidated health was the biggest open secret of the campaign. Every week, we got a glimpse of her falling down, slurring her speech, losing her motor controls, etc.
On top of obesity and alcoholism, she's got some sort of major neurological issue. I think she'll be an invalid by 2020.