I suppose I never think of planes: I always assume that she would eventually get called to London (or Rome?), and from there, Africa is overland. Alternatively, I can see her either getting stuck on a transport ship, or signing on as crew for some spending money. Still no intentionality (because you're right, she doesn't have that sense of purpose), but she does have a sense of adventure, or rather, no sense of roots.

That said, I've never tried to get Faith and Xander together in Africa; I think of Faith there on her own. It's a big continent, after all.