weak and confused

I wanted to describe what I mean by weak and confused for Marie. She had little strength in her legs. If Marie was sitting in a chair, she would not be able to stand up. I know she was very weak, but I also think she had a problem of remembering how to stand up. I have no way to know how much of that was lack of strength, or lack of memory. She could walk, but not too far. Walking from the car to a building was one thing, but navigating throughout the building, to get to a doctor's office was another thing. A wheel chair would be necessary.