Life is not kind at the end. Under these rules everything becomes more painful. Best wishes for the time ahead.
My mother passed after my father and she had a number of the problems that sound similar to your mother at the end. She signed the DNR because she said it was time and she no longer enjoyed the time. She felt like she had made the most of her life and hated being a burden. If someone had said that to me years ago I would not have understood. Now I understand what she meant.
When you get one of those little moments think of the best times.
