A. The decision to undergo a surgical procedure in this case is only yours. If you are sure the lump is not cancerous and if the lump is not affecting her quality of life (not impairing her ability to move, eat, defecate or urinate, not getting infected or sore, not scratching and other considerations), I would say that surgery is not essential. With old age and other health problem (such as heart disease) the risk of anesthesia increase reasonably, and that is something that you certainly need to take into consideration.
Your account has been reactivated.