What can I do if the judge ignored evidence from child protective services

It sounds like the Judge did not find the evidence credible; however, once the police and child protective services investigate, it may turn into a Dependency case. If the boy, now an adult, is not related to your daughter, you could file a restraining order arguing that your daughter should have no contact with this adult due to past sexual abuse and her fear of him. If you already tried that in Family Law court, and the Judge denied the RO, then you may need to petition for appointment of a minor's attorney. In Family Law Court, the parents will be liable for the costs of a court appointed minor's counsel. I recommend getting your daughter into counseling and allowing the therapist to determine the credibility of the child. Therapists are mandatory reporters and if the child's statements about the sexual abuse appear credible, the therapist must report it to the police and child protective services.