My Mom Is 82 Years Old And Is In The

My mom is 82 years old and is in the hospital . Dr said she only has 15% of her heart function and has clogged arteries. She is in I C U and using oxygen. She doesn't have any appetite and the little bit she eats vomits it out. Dr said he might release her on Saturday. How long do she have to live and shouldn't she be kept in the hospital?