Hi i am Dr Ahmed Aly
thanks for using HealthcareMagic site ,
I had gone through your question and understand your concerns ..
I hope she feels better soon , from your given history the tiredness
, pain , fatigue at an age of 80 , arthritis
and a history of COPD is highly suggestive to anemia or deficiency of any kind .sometimes physiotherapy
and some multivitamins is effective in most of cases .
I recommend a neurologist
or a rheumatologist
will be fine with further clinical investigations like blood CBC , urine and stool analysis and follw them up with her physician for proper evaluation and management.
Please click and consider a 5 star rating with some positive feedback if the information was helpful. Wish you good health,
Any further clarifications feel free to ask.