Do not make her self conscious that she stutter. That she has some kind of problem that has to correct. She is just learning words and how to express herself. Chance´s are that she will outgrow the blocking behaviour. But she can get stuck if she get´s obssesed with stuttering and what she has do to right or correct. The obssesion with control make us think every word before speaking and that only amplifies the stuttering. Give her love everytime she speaks and she will not feel scared to express her emotions and feelings.