Disc Issue- Physiotherapy or Medical?

My mother's age is 48. She used to feel pain in her left leg whenever she sat down or while in the bathroom since a few weeks. We did an MRI scan. It showed that the disc L4-L5 & L3-L4(a bit less) is supressing the nerve which goes to left leg. The doctor(Neurologist) had given her medicines-Sealon, esoflam, pantosec-d, neurovion temporarily and suggested her to get admitted in hospital for 7 days during which she will be treated on injections and medicines. He said there isn't any need for any operation. Now my mother has stopped bending forward since 10 days. She feels  a bit of pain in left leg continuously now and more pain while sitting in toilet. So can physiotherapy treatment help her to get relieved of the pain PERMANENTLY & can it help in freeing the nerve which is suppressed. What treatment should be best for her right now- Physiotherapy(and what treatment in it) or Getting Admitted. And What kind of treatment should she follow in physiotherapy? Thank you.