I'm all for Jr getting therapy. This is an incredibly traumatic situation for him. I don't understand why Ronald or his lawyers would be opposed to it. Everybody in the family must be willing to support Jr in any possible manner to learn to cope with the situation as best he can.
If Crystal took him to see a therapist illegally she wouldn't be able to use any information that was obtained during such sessions, would she? If she got a therapist to create a certain false memory for him she would have to explain the background to get the false memory "right" so the therapist would not have the excuse of not knowing about the legal situation. But I don't really see what the use of getting an unethical therapist to mess with his mind would be. Jr doesn't benefit from any of that, it doesn't help to solve Haleigh's disappearance and I don't suppose that Crystal would be able to use any information that was obtained during an illegal therapy session with a therapist with questionable ethics in custody proceedings, would she? It wouldn't work in her favor to throw stunts like that, if it was even admitted as evidence.