You can get an Electroneuromyogram (ENMG) of the muscles in the right hand done to rule out any involuntary neurological cause.
Clinically, if the movements are spontaneous and occur without the knowledge of your daughter, we can say that it is involuntary. ENMG will confirm any pathology, if present.
Most probably, it seems like a simple nervous twitch
. However, get her examined by a Neurologist
Hope this helps.