You might also want to have her CSF independently tested for nematode worms. (what I mean by this is to put it under a microscope). it surely won't hurt, as some pathologists (although not published yet in the medical literature AFAIK) are finding them in all the samples they have tested for.

More information: https://youtu.be/aTPU87CKQLQ?t=6m30s

If this proves to be the case for your aunt, the good news is that anti-helmintics like Ivermectin, could efficiently treat the underlying cause.

You also might benefit from performing Metagenomic tests ( such as Digital Culture by Karius - kariusdx.com) to look for insidious pathogens that might play a role in her illness.

In other words, there are many different things that might cause the symptomatology described as "Multiple Sclerosis", Lyme disease actually being one of them, https://youtu.be/Fy0ViOX7xNk?t=9m37s