Greetings, sorry about the pain.
Never jump to do surgery. Surgery is not the solution for most back pain and for your mother as well.
Next Steps
get to see a physiotherapist specialised in posture correction, you mothers problem is solved. back pain of your mother is for two reasons, a.poor core muscle strength b.undue muscle tension causing excess stress at lumbar disc and sacrum bone. both can be cured by doing trigger point therapy which physio is best at these.
Health Tips
if any concerns do let me know, if for various reasons unable to find cure, please do visit me, will assist.