Im a social worker in Children's Services.
Just so im clear, your friend has told you that Childrens services have told her to make a self referral? For what? A CAF (Child and Family assessment)? or early help?
We would never tell a parent to self refer for a child and family assessment.
It might be they have told her to refer for early help? Or have school referred the family in to Children's Services? In terms of our role-in my local authority, we work with children and families on Child in Need Plans, Child Protection Plans, and also work with children who are in the process of being removed. We have a separate department who work with families on early help plans. But my role is very much geared around the Children's Act and that determines our level of intervention.
It could be your friend has heard the words 'social services' and panicked.