Thanks everyone. I am going to check with my sister, and encourage her to get on the fast track to a neurologist, and not piddle-poop around with it. She didn't have any falls or anything recently, although she was in a car accident this last summer... head on... and I suppose it is possible something subtle could have gone amiss with her spine...that is first showing now.

And then... there is the autoimmune potential. Thanks for your thoughts on this.

Cara