I hope you don't do it! Oh my goodness, I don't care if people want to live tight, have no life etc., that's their business. But when they start to use people and become selfish that's when it angers me (have seen a few examples of this in my life), and as for the woman above, I'd tell her where to go. It's ok for you to pay to run a car, but this woman who could afford a personal chauffeur wants you to pay for her transport...
maybe what she wants is attention and companionship from family members. Just speaking from my experience so far with elderly family.