If its appear recently and not present earlier then its requires examination to rule out any pathological cause and investigations sos

That symptom will get resolved, help her or ignore before her , just help her with words ,this will go off .It occurs most often in children between the ages of 2 and 6 as they are developing their language skills.developmental stuttering occurs when children’s speech and language abilities are unable to meet the child’s verbal demands. Provide a relaxed home environment that allows many opportunities for the child to speak. This includes setting aside time to talk to one another, especially when the child is excited and has a lot to say. Listen attentively when the child speaks and focus on the content of the message, rather than responding to how it is said or interruptng the child. Speak in a slightly slowed and relaxed manner. This can help reduce time pressures the child may be experiencing. Listen attentively when the child speaks and wait for him or her to say the intended word. Don't try to complete the child’s sentences. Also, help the child learn that a person can communicate successfully even when stuttering occurs. Talk openly and honestly to the child about stuttering if he or she brings up the subject. Let the child know that it is okay for some disruptions to occur.