Our expert says:
There are actually several possibilities, including a dystonia, or an obsessive tic, but it is probably a behavioural tic related to distress at her grandmother's death. As that happenedonly 2 weeks ago, these are still early days, and the habit may fade away. If it persists much longer, though, it'd be worth having her seen by a child psychiatrist for a full assessment, to clarify what is happening, and advise on managing it
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