Family therapy might be really helpful for this child. I get the feeling the child is being torn up by the parent's behavior. It makes me sad that this child is so distressed.

I'm sure there are exceptions to diagnosing, and a diagnosis is not even always given, even if symptoms are treated. OCD is about fears and fears can disable a person at any age. So, perhaps the doctor is treating symptoms, in hopes of giving the child some relief of the awful anxiety he/she is experiencing. This really needs to be taken seriously, to resolve it, even if it isn't believed.

Did this parent (your friend) give up parental rights? The reason I ask is that he has the right to know who his child's doctors are and to communicate with them. Is your friend active in the child's life?

I know it is frustrating when it seems someone is not being truthful, and I hope all parties can address their own issues of fear and mistrust, and do what is best for the child who seems to be kind of a scapegoat here. Raising a child, whether parents are together or not, takes a team that is willing to work hard and get help when disagreements start harming any party involved. I probably sound preachy but I don't mean to. I just care very much for children caught between warring parents and/or have extreme anxiety during the years that should be their carefree years full of being surrounded by love.