Ask the child directly, using communication they can manage, and examine observations from daily life. A family account that challenges your interpretation deserves investigation. Describing it as weak boundaries or lack of cooperation does not answer it.
Revisit your explanation and recommendations when they fail in practice. Consider health, sensory, learning and communication needs alongside context; tell the school what your advice means for an actual lesson or break. Specify what adults should change, how benefit or harm will be recognised and when you will review it. If earlier advice was incomplete or harmful, explain the correction to those who received it. NICE's reassessment guidance supports review of contributing factors; it does not make a professional's first interpretation final.
For bullying or exclusion, use the instructions for this role.