M.L.
She's 6, I would talk to her pediatrician about this for an evaluation. My cousin has Tourette syndrome and it started out a lot like this when she was a young child, it got worse as she got older, then it went away once she hit her late teens, which is fairly common. It doesn't always have to involve ticks or jerking body movements. Stress, excitement and worry can make tics worse. I would journal the days that she is worse, to see if there is a pattern, if those are more stressful days for her. It's still early and she can learn to help control it with a little bit of therapy on coping skills.
http://www.webmd.com/mental-health/tc/tourettes-disorder-...
http://kidshealth.org/teen/diseases_conditions/brain_nerv...