As Uppitycats stated above you can develop an effect to your central nervous system. I have read that if you have an autoimmune disease it is possible to be prone to another. I was on Enbrel and then Humira for RA, I also have FM, and I started having sx of MS, I was dx'd with MS in Jan06, had ON and other sx, then a LP and MRI was done I have lesions on brain and spine. I was immediately taken off the Humira and hospitalized. Since then my RA has been out of control, after some IV treatments it has calmed (RA). Please have your friend request to see a neurologist. I hope it is not MS, Lupus is enough for her to deal with I am sure, I hope this helps. Remember, unfortunately, this is only MY experience. Take care.
Dx'd RA, MS, FMS, CTS, CFS, Hypothyroidism, Dep, Migraines, Optic Neuritis.