Have you had any contact with the psychologist?
I ask because we had a very similar issue. The ex was taking SD1 to a counselor who she told that child was molested. Counselor then treated the child as though she had been molested with no evidence what-so-ever. Long story short, we went after the counselor and, not only did she fail to appear in court, she eventually got her license suspended.
I would bet a million that, if you had a look at the therapy notes, you would see that the therapist had been told by the mother up front. That means she (or he) did not do an objective analysis of the situation.
It is not unusual for a poorly trained psychologist to become manipulated by an alienating parent. Ever heard the saying "When you're a hammer everything looks like a nail?" Well, alienating parents will often seek out therapists who specialize in treating victims of sexual abuse, then present the child and tell the therapist that the child was molested. The therapist never even questions it, or considers that the child may be a victim of alienation.