My Mother 75 Years Heart Attack November 2010,now Heart Functioning

My mother 75 years heart attack November 2010,now heart functioning about 25% ,one main arterie blockakage 100%, she is taking medicoines ascard plus forte,nebil 2.5mg.tasmi 80 mg risek 20 mg, She is very weak and unable to get up from bed at her own since last one month. How can she overcome weakness
Regards
Nadeen
Islamabad Pakistan