Glenn: I am sorry if I stepped on your toes. The fact is, as I believe PIB has said somewhere before: "If she has not obtained a visa by her age, she will not get one." It is just a fact of life. If she has widely traveled, but not to the US, and she has returned, as Anna said, then there is a slight chance she will get a visa. Negatives are: Single, poor, not propertied, no vehicle, no major pull to come back. This is what the Visa Consul will be looking for. If she any relatives in the States, that is another red flag.
Years ago, and still today, some families traveled with their "retainers", but these people are so far up the food chain as to be unapproachable...
I think your efforts to get your friend a visa are admirable, but I don't think it will happen..And please, if it should happen, let this board know, okay?
HB