A neuro condition could cause symptoms like SPD (i think you are talking about sensory processing disorder) as well as muscle jerks. Or there could be a primary condition of SPD where muscle jerks as a symptom.

If you can record your DDs movements, it might help the Paed work out what the cause might be. Also noting when they are more likely to occur; at rest or play, day or night, after or before food, when tired or active... If you talk to her when she is experiencing them do they stop?