Child Refuses To Eat, Not Gaining Weight. Help

MY CHILD WAS NOT A CHUBBY TODDLER, SHE IS ALWAYS HUNGRY, AND HER WEIGHT IS STARTING TO BE A PROBLEM, SHE REFUSES TO EAT HER GREENS, SHE WANTS TO EAT ALL DAY AND I AM REALLY STARTING TO WORRY, MY FRIENDS AND FAMILY TELL ME TO LEAVE HER BUT, THE CHILDREN TEASE HER AT SCHOOL. SHE DOES DANCING TWICE A WEEK AND SHE IS ALWAYS ACTIVE AND SWIMS ALOT, HER TUMMY IS VERY BIG, I HAVE BOUGHT DEWORMING TABLETS BUT NOT SURE IF THIS IS THE PROBLEMS AS SHE IS NOT SKINNY, SHE STOOLS REGULARY. HER FACE IS ROUND. I HAVE TAKEN HER TO THE DR BUT HE FINDS NOTHING PHYSICALLY WRONG, PLEASE HELP ME I DONT WANT MY CHILD TO BE OBESE.