The suggestions above are excellent. If you're looking for alternatives to try in this situation, there are many-- do not despair that you have exhausted all your options. There is hope around the corner.
In terms of running out of standard treatment options, I would recommend you read up on Low Dose Naltrexone, Aimspro (Goat Serum), and antibiotics (minocycline). While none of these are yet approved as treatments for MS, if you are determined enough, it would be possible to procure them.
In the meanwhile, I would suggest you take her to another MS Specialist and at least confirm that the course of treatment she is getting right now is indeed the best possible.
Please provide us updates as they become available, we are all concerned...