Should we become friends again?

im a freshman in high skool and during my last year in middle skool i become friends with a girl. we hung out alot and became best friends. but the problem was that she was a 6 grader so she would be soo immature sometimes. so during the summer i just really got tired of her attitude and her also just being really immature so i just stopped talking to her. but now i kinda miss her and im wondering if we should become friends again..... now she is ind the 7th grade and im in the 9th