My mother had a sister just like this. Our family took her in for several months. It was a miserable experience as she was demanding, selfish, and openly flirted with my father. My parents helped her for years, moving her and paying for her apartments. She had two daughters who never contributed a dime to her support. You can only help people who really want help. You are under no obligation to take care of this woman. If you decide to become involved, she may take advantage of you forever.