Welcome to HCM,
Your mother is having a heart disease Cardiomyopathy
,there is pump failure in this disease as we know heart is working to circulate blood as pump.
She is 69 year young lady please take care of her with optimal medical therapy she can be stabilized with salt restriction,diuretics,ACE inhibitors,if possible with low dose Beta blockers.
Cardiac nutrition like Co enzyme Q 10,L Carnitine,if required amiadarone?
Please note nobody can predict life span,we should try our level best to help patient.
If she has indication yes Cardiac Re synchronization,and placement of AICD are mode of treatment.
Also Cardiac Transplant if possible limitation is by cost and availability.
Best of Luck