Dear friend Spondylolisthesis is a very painful thing as there is fracture and the vertebrae is moving over one another whenever she is bending or moving. It's like a fracture moving which causes pain. But here we are not treating the MRI we are treating a patient and her symptoms we need need to look how are her symptoms and also if the listhesis is stable or unstable type. If its stable and not much symptoms in terms of claudication or neuro deficits then you might no surgery and can be very well treated with medication exercises and posture modification.

Looks like slip of one block over another. Mask her to avoid weight lifting and bending over. Use western toilet Not to sit on ground Wear belt Daily walks

You need to consult a Orthopaedic doctor and get your mother examined.

This report suggests that she is having  spindylolosthesis alongwith degenerative changes.. it means that vertebrae are not in straight line.. one vertebrae is going ahead than the lower one.. that may cause severe compression of spinal cord..  What complaints is she having at present.. There is a possibility that she may require surgery..