Is this MS that is slowly progressing?

Here is My Question:
For over 5 years, my mother has experienced progressive loss of leg strength and has an inability to walk with lots of fatigue of legs, heavy legs, jelly legs, weakness in legs, and numbness along with hip pain at times. She was diagnosed with possible OA in feet and slight L-spine herniation/bulge but stated not enough to cause issue. RA level was normal.

She experiences tingling and numbness in fingers at times as well. No pain in legs just a pins and needles, weakness, jelly feeling that causes her to stumble. EMG/NCV,eye, DXA exams normal. She did have shingles earlier this year. She has to hold on to things when walking, showering, etc. Most issues are from hips down. She went to PT issues, but it helped very little.

I'm worried this is MS that has been slowly progressing, but how can I get doctor's to test or look further into her symptoms without them all stating the same thing, that it is related to her SI/piriformis and OA from age? Thank You.

Answer:
MS is a clinical diagnosis (which is extensively documented on the site) which is best reviewed and applied by an MS specialist who is well versed in the McDonald Criteria.  If you provide the city/state of your family, we may be able to give you some names of a specialist that you could reach out to for another opinion.  

A. Scott Nielsen MD MMSc
Neurologist and MS Specialist at Kaiser Permanente