Patient unable to walk. B 12 supplement?

Respected Doctor, This query relates to my mother aged 81+. In November 2022 she had scrub typhus and after successful treatment discharged. Besides  she had a compression fracture of the spine (D11 and D12) and a minor fracture of the inferior rami. She also had MRI and CT scan of the brain and the doctors said it's nothing to worry about . Since then, unfortunately, my mother is unable to walk. All she can do is walk a few yards with the help of Walker. You will find it interesting to know that she has no problem in doing all the prescribed exercises while lying on bed ( Quadricep drill, hip raise, etc). Now, out of the urge of knowing what exactly is wrong, I, went for doing the tests of Vitamin B12 and Calcium ( 25-Hydroxy). Vitamin B12 level is shown as 353 and for 25- Hydroxy it is 27. She is a osteoporosis (age- related) patient too. A few weeks ago, a single shot of Deca Durabolin 25 was administered which gave a little strength. Should we start vitamin b 12 supplement?