she don't want to let go of me

Last time when I used to teach her; she liked to play around the class, go around the class, and even bit me from my back.
Today I was assisted in 5-year-old class. Al like to sit with me; directly, because of my existence, she had no concentration on teacher. When i tried to go away, she grabbed my hand tightly and don't want to let go until she accepted my explanation.