Yes My Sister Is 57 Years Old And Was Told

Yes my sister is 57 years old and was told her heart function was at 15% and was put in a zoll lifer vest for three months and then they put a defibrillator in. They said they dont think any of function will return and they have her on medications. What is her life expectancy? Should she be on a transplant ljst. The heart dr has not mentioned that.