Weight will depend on ones body structure and the average weight for a 13 year old girl who has a height of 5 feet and 6 inches is somewhere between 100-150 since this is when a girl is turning into a woman. Your ideal weight is unique to you and you can consult your doctor for more information.
Depends on your build and on how active you are. Muscle weighs more than fat. One of my ex's is 5'6" and a size two but weighs 140. She had wide shoulders and ran 5-10 miles a day, she was built like a rock. I also have a cousin who is very petite and is your hight and weighs 110.