Siatica Pain. Would be helpful!

My mother has done MRI and report showed L1-L3, L4-L5, S1. She is in deep pain and she is also a cancer patient which has been diagonised in October last year. Operation had been done and then chemo cycles are going on post which radiation will get started. Since this pain related to the spine problem is very intense she isn't able to sleep or stand properly. Can you please suggest what should be done so that she can be relieved and cured of this pain. I am not interested in surgery in first place. We thought about - physiotherapy but not sure where to start as the situation as of now due to her cancer treatment the spine problem remains Un-addressed. Could you suggest few home readies till the time chemo radiation gets over. And also can you suggest if chiropractor and physiotherapy would be helpful