My sister is 16 years old 5'9 235 pounds and is finding it hard to have a social life because she is so big but can't afford the gym, she needs help!?

Overweight sister: First, a visit to fp to check for diabetes, underactive thyroid, cushing's (excess steroid production), etc. Her bmi=34.7 (obese); her ideal body weight should be in the 145 lbs range. If medical problems, treat them. But weight loss is doable thru portion control (to decrease calorie intake) & exercise (to burn off extra weight). Using a salad plate instead of dinner plate, healthy foods; walking.