Gary might have the best advice on what to tell Alex, or how.

as she refuses to get help or acknowledge she has a problem)
Just off the top of my head...which isn't always good! - something along these lines might work: "Your mommy loves you very much, but right now she is very sick. When she gets better, then that's a good time to visit. The judge knows the doctors who will make her better - so let's hope she goes to see her doctors, okay?"

Clumsy, but maybe you get the idea?

And if he DOES get to write her, he can say 'when are you going to the doctors so I can see you?' (okay, evil of me! )

hugs