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She has block in the blood supply to her heart.
Her heart function is poor
The prognosis does not seem to be good – apart from ejection fraction
, it also depends upon valves’ integrity and function / wall of the chambers / arrhythmia
, their nature and frequency / renal function / response to medicines.
You have not stated her personal habits, family history, or co-morbidities, even age…
Further deterioration can be prevented or postponed by aggressive management.
If there is further deterioration, heart transplantation
may be the answer...
The treating doctor alone can suggest further based on his assessment of the situation.
Wishing all well