Highest recorded BMI is 204. A BMI of 50 is astronomically high. So, a healthy person's BMI is between 18.5-24.99, anything over 24.99 is overweight. Anything over 29.99 is obese. Anything over 40 is Morbidly Obese. At a BMI of 50, she's Super Morbidly Obese, or Class 3 obesity. At a BMI of 50, she probably has diabetes. She probably has high-blood pressure. It's estimate that nearly 220lbs on her, or 66%, of her mass is fat. With that much fat on her, doing daily activities is greatly hindered, however, she's also going to be much more muscular than your average 33 year old woman. Due to lugging around her massive body all day, her muscles will be naturally worked out even doing simple tasks like standing up. Her TDEE is 2,700 calories -- roughly what a 23 year old, 7ft male would need to exist. She could justify eating that many calories if she were a 6'4 female bodybuilder, cutting to a weight of 180lbs. 2,700 calories is 60 McNuggets a day. That is roughly 17 deep fried Oreo cookies. That is 23lbs of cabbage, daily. That is 43lbs of lettuce, daily. She could fast for, roughly, 285 days before her body ran out of fuel. If she loses 2lbs a week (what is recommended by the CDC) she will need to diet for 83 weeks straight -- or 1 year and 6 months.