Hi Noman, Your Mother seems to be suffering from complications of degenerative disc disease
. Since she in on steroids
do make sure she is taking Calcium and Vitamin D3
supplements to help prevent progression of Osteoporosis
at her age. The pain she experiences is due to nerve getting pressed by the degenerated and herniated discs from her spine. She can try using a Lumbo-sacral corset belt to attain better posture while walking and reduce her symptoms. Usually, the main exercise you will be asked to do is that of extension which is leaning backwards by propping yourself up on your elbows when lying on your front. This mobilises the joints but more importantly closes the area of the prolapse and reduces the disc prolapse
. If the disc prolapse is reduced the tear in the disc can heal.