If you go somewhere with a sister that is always complaining about not having enough money to get to the end of the month to eat, do you pay for her?

I have a sister that is always complaining about not having enough money to get to the end of the month with food. But, she has every new electronic device anyone would want. This is the same sister that came to my rescue when I was a single mom, working to make ends meet, but would run into short months. She would come to my house with box of food for me and my 2 children. I will never forget what she did for me. I love her, she has a big heart, but on the other hand, she feels I owe her. So, when we go anywhere, I pay for her, whatever it is. A movie, lunch, shopping, whatever.