If it is white muscle disease and you give her injectable selenium, you should notice improvement in 5-7 days. A neuro exam would need to be performed by a veterinarian and injectable selenium is prescription so you would need to get it from your veterinarian. She can still get white muscle disease even with access to a mineral block....may not have licked enough of it to prevent the disease. Tetanus is still a possibility. They get better with antibiotics (usually high dose penicillin). They still can open mouth with tetanus. Other signs include stiffness in rear legs, holding ears erect/stiff, bloating. I would also be concerned with a back injury. If she is not getting better with your treatments I would suggest a veterinary exam so if it is white muscle disease she can be treated accordingly. To answer your original question.....I highly doubt your goat has West Nile Virus. Hope that helps!