I tell you nobody on this earth can really assess a person's death, other than God. You should not loose hopes and take care of her till end.
Multiple strokes and a recent heart attack
can really make a person bedridden. Because the major organs in the body are brain and heart. When both gets damaged, the vitality of human body is lost.
In that state, without medication I have seen patients surviving for months together.
All the best for her and let Him give an opportunity to her to take proper medications.