V.B.
My son stuttered a lot at this age. My question to you is "Does your child have a larger vocabulary than most children her age?" My sons vocabulary was huge and I decided that his brain was working faster than his mouth was capable of talking. I had to listen to my parents comments about getting help for him, but decided to stick with what my instincts were telling me; He'll grow out of it. I never finished his words for him and I didn't draw the stuttering to his attention, and he grew out of it by the time he was around 4. He is 15 now and no stuttering problems.
This was my experience. However; as a preschool teacher I always tell my students parents it is worth having things evaluated just to make sure there is no bigger issue.
Hope this helps.