Correct your point of view, fat and muscle are different tissues and cannot be transformed into each other.

The two pounds added are not necessarily muscles. You think muscles are that long. Especially for girls, it is difficult to grow muscles.

You can't get the result in a week.

Stick to it. Do aerobic exercise. If you can't do strenuous exercise such as running and jumping at first, you can improve your physical fitness by walking quickly. Wait until you are physically fit, then run and jump. It takes some time, and aerobic exercise is best in 45-60 minutes. Your fat supply is after 20 minutes, so your fat consumption is very small less than 20 minutes.

Stick to it for a year or two and you'll lose weight. Stick to it for a lifetime and you will live longer.