I ended a friendship over this. She would do this sort of thing all the time. I invited her once to a women's group which was a special evening. It was a white elephant thing - you brought with you items you no longer wanted to exchange with the others. She didn't bring anything - yet she managed to take nearly everything home with her. I told her upfront she had put me in a really bad position with other friends and that I was humiliated by her behaviour. She was incredulous as to why. I turned around and walked away.