Saying she needs the money for one thing and using it for another is dishonest to be sure, however I would suggest you consider that any stranger you give money to could potentially do the same thing. In the end I would suggest that you not concern yourself so much with the "Why" as the content of ones character is more pronounced in the act of giving to a stranger who has asked. This demonstrates the content of your soul. at the point the test of character is now on they who have accepted your generosity. Don't be angry; be saddened, but hope for the day that someone benefits from your genero