How does being a psychologist constitute a reasonable qualification to have any weight on the matter? Vaccinations belong to the field of pharmacology, on which psychologists have no training whatsoever (possibly aside from psychiatric drugs) and if they do, they’re most likely a psychiatrist, in which case they’re doctor first and psychologist second.
The author has no qualifications whatsoever to talk about vaccines, aside from her doctoral dissertation, which I would consider questionable at best.