Why can't she say to her straight up "look, I was happy to give you some money in return for all the help you gave me when I needed it - but in fact, I've got no more money than you, I don't know why you keep coming round here talking about money". We had the same with a tradesman a while back, first off he asked us for money up front to do jobs then started saying could we lend him x - no, we couldn't, we don't have spare cash and we're not a soft touch. I think your friend will have to be blunt and tell gil that she can't keep coming several times a day. If she won't do that, why doesn't she just not answer the door?