I tend to work around the Faith canon post-Chosen thing by going with the presumed Faith spinoff model, which suits her very well: rover. I imagine that she travels well, and provides assistance when and where needed, but not as an actual full-time job. She doesn't really seem like (has never seemed like, for that matter) the type to sit around in one place. I tend to think that she more just wanders around killing things.

I like all those stories where she's a guardian of a bunch of slayerlets, because they force Faith to deal with new situations, but it doesn't seem like it plays to her strengths.