Why won't doctor prescribe medication for elderly patient?

A relative was recently admitted to hospital with hugely swollen legs which were diagnosed as a result of congestive heart failure. She was discharged with no medication whatsoever, including no diuretics. She is in her 80s and had meds/oxygen for emphysema. I can't help wondering if they have just not prescribed anything because of her age and pre-existing condition. Any medics out there who could advise?