What is the treatment for Degenerative Spondylothesis ?

My mother has got degenerative spondylothesis and suffers with it in the top of her neck (im not entirely sure on the area - i believe it is C5/C6/C7). She also has reffered pain in her elbow which has been diagnosed as Tennis Elbow. She is loosing strength in both of her arms but mainly her left arm is affected. This leaves her struggling to perform daily tasks that most people would find simple. We have been told by her specialist that no treatment / cure is available - the only thing that can be offered is pain management for quality of life. Apparently surgery will never be an option. She is currently on Omeprazole (Gastro-Resistance), Etopan (600mg) in the evening and Amitriptyline (20mg) before bed. She also takes cocodamol for break-through pain but they aren t affective. Does anyone have any advice or anything that could help us please? We have tried most remedies (i.e. physiotherapy , tennis elbow cream, brace for her elbow, acupuncture ). We know the condition she has is not curable but we would like to help reduce the pain to give her a better quality of life. We will be seeing her specialist to review the pain management but the time frame between seeing the consultant and getting treatment is too vast which leaves her in agony.