I think we can be quite positive about your mother's life expectancy. If 2 of the three main coronary arteries are open with successful stents, and she is well without severe angina
or heart failure
, her life expectancy is not much different from normal. You dont say anything about her heart function: this would have been measured by echocardiogram
, but as long as this is good and she does not have other health problems her life expectancy is only slightly less than the normal of 11 years for this age, say about 10 years.