A child’s mental incapacity to proceed, as defined by this Title, may be raised at any time by the child, the district attorney, or the court. When the question of the child’s mental incapacity to proceed is raised, there shall be no further steps in the delinquency proceeding, except the filing of a delinquency petition, until counsel is appointed and notified in accordance with Article 809(B) and the child is found to have the mental capacity to proceed.