As long as the stuttering is infrequent, and there doesn't seem to be any triggering mechanism, I wouldn't worry about it. I did something similar, and I outgrew it. It's a thoughts-running-faster-than-mouth thing. It's probably helpful to point out the stuttering behavior from time to time, though, so it doesn't end up becoming a permanent speech tick. She may not notice she's doing it, just as many adults don't notice they're saying, "You know what I mean?" or some variant after every... single... torturous... phrase.
I still occasionally have an issue where I lay out a sentence in my mind, start speaking it, and halfway through decide to substitute a better word. The two words end up colliding on my tongue, and I end up delivering a hybrid morphling of the original words. DD9 finds it entertaining.
