How often does this happen? Are there activities that seem to lead up to the movement? Is it rhythmic?
One thing you can do is see if you can stop the activity by touching her. It is more likely to be a problem if touching her doesn't stop the activity. If this continues, or if you notice other behaviors like eye movements, lip smacking, more body parts involved, you definitely need to take her to the pediatrician and get her checked.
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