You didn't mention if she was crawling yet, but since you did say she tested at 5 months in the gross motor area, I would assume not. (day2dayparenting.com)
The number of neurons in the brain's motor areas vastly exceeds the number of muscles, meaning that many different patterns of neural activity could be responsible for the same movement. (simonsfoundation.org)
The researchers observed overactivity in the supplementary motor areas of the participants and deficits in the appropriate selection and preparation of their movements. (sciencedaily.com)