How do you know it is parental alienation—and not justified rejection and estrangement?
In a case where a child rejects contact with a parent, a psychological evaluator or skilled GAL can determine if the rejection is unwarranted, which is called parental alienation, by making a thorough investigation of the empirical facts over time. If the child has a legitimate reason to reject a parent, it is called estrangement. There are in my experience cases where both factors can exist: a targeted parent is being alienated and then acts in negative ways with the child that solidify the estrangement.
An evaluator can use the Five-Factor Model to identify and diagnose parental alienation. If the answer, after thorough and qualified investigation, to all five questions below is yes, it is most probably a case of moderate or severe parental alienation.