How much should an 11 year old girl should weigh with the height of 4'8?

About 70-90 pounds, depending on her bone structure. Do not get frusturated if you look fat, because if you are within this range you are still healthy. Also, different girls have different bone structures. So girls with bigger bone structures may weigh more and that is okay. As long as you eat healthily and excersize than you have nothing to worry about. Love yourself the way you are but also stay healthy.