A useful tact to take is to increase your child's play time with classmates and school friends. It is understandable for parents who like to spend time with their children to be reluctant to give up precious hours. But it is essential to build up the child's self confidence away from the family structure and security. Consider invitations of classmates to the home. School related activities are encouraged.
Most school phobia is worked out over time without psychological or psychiatric counseling.
If you feel you have exhausted all your options then I will be happy to discuss a therapist for the child and family.