It is hard when the woman that gave you life is nearing the end of her own. The fact that she has outlived many does not make this fact any easier to cope with.
Each time you see her, be it a day, two days, or more, you can see how frail she is becoming. However, she wants to remain independent. How long do you allow this, is it your choice to make? She is still feisty and stubborn to the bone which makes it more difficult. She is determined to have things her way no matter what. The hardest part is figuring out what is her normal manipulation that you have dealt with your entire life and what is caused by her age and the dementia that is truly taking her from you.