I m 19 yr old girl my hight is 5.1 n weight is 40 kg. Hw cn increase my health n hight?

Hmmm. You can't increase your height if you have stopped growing. Weight is a different story. That can be increased by increasing calorie count.
Platform shoes. Unfortunately, by 19-20 years old, most peoples' bone growth plates have closed, and you are as tall as you are going to get. Should discuss with your doctor or an endocrinologist to see if any available options.