Need Treatment For Leg Pain And Stiffness With Leg Neuropathy

My mom is 97, had lower leg neuropathy for many years. 3 months ago, stubbed R big toe, blood blister on tip, toes get very blueish/blackish when socks removed. Last Wed. night she awoke with leg cramps up and down her R leg, this kept happening for 2 days (went to dr. and to ER) she was screaming with pain. It seems the cramps have stopped, but leg is so sore and stiff she cannot walk. Dr wants to do an angiogram. Will and how will she heal? What should we do to help walking. She does take Tramadol and a prednisone tab. She is not diabetic.