Sudden strong numbness attack in body.

Hi my mother had a sudden numbness first in her legs and gradually moved in buttocks and stomach and back but .. We admitted her in vihmans .. They did blood test in which b12 and d3 was highly deficient her nvs is done and doctor told the nerves have been weaken .. She is also diabetic with hba1c 7.8 measured in hospital .. Doctors have given her b12 shots and d3 also.. Even after 4 days there is just 5 % improvment in the way she is able to walk but with support. .. But strong numbness is still their.. I want to know she is still admitted and how much time will it take her recover .. Means will therecovery be very slow and she should continue is the hospital or the treatment given is not right .. I want to know will the numbness go away completly or not ? Please Help