First I would take her out of the "so much bad in this world" mindset and make her see all the good in the world. Then conncentrate on what makes her feel good to do in this world, and concentrate on that, and doing what you can to help out with all the bad things, even if its something as small as helping an old person cross the street. Its like the starfish story. One at a time. My mission would be how to enjoy this great world we live in, the life we have, and how to be happy. I would not go door to door telling people that the way to happiness is being a slave for the wts. But thats just me.