This is a heartwarming story illustrating her helping others even she was not in her top situation herself. The point is that we should help at our best capacity, sometimes it can be difficult to do.
Luke 6:38 “Give, and it will be given to you. A good measure, pressed down, shaken together and running over, will be poured into your lap. For with the measure you use, it will be measured to you”. But we should not focus on what we get out of giving, but doing so would miss the point. Jesus preceded that statement with this one: Luke 6:35 “Love your enemies, do good to them, and lend to them without expecting to get anything back. Then your reward will be great, and you will be children of the Most High, because he is kind to the ungrateful and wicked”. We don’t give to get things; we give because God delights in our generosity. Our love for others reflects His loving heart toward us.