Final answer:
Betty, who has involuntary writhing movements due to cerebral palsy, most likely has athetoid cerebral palsy.
Step-by-step explanation:
Betty, who experienced traumatic events during the birthing process and was diagnosed with cerebral palsy, presents with writhing, involuntary movements affecting her activities of daily living (ADLs) and play. Based on these symptoms, Betty has athetoid cerebral palsy, which is characterized by these involuntary movements. Athetoid, sometimes also referred to as dyskinetic, involves fluid, uncontrolled movements, unlike ataxic cerebral palsy, which is associated with a loss of muscle coordination. Cerebral palsy is a neurological disorder that arises due to an injury to the developing brain, potentially resulting in various motor dysfunctions.