I get where you're going with this because she IS significant (she shows up in the season finale as well) and relevant to the theme of SOA, but I wouldn't go with anything literal like "homeless girl = actual angel". Like with all episodes in Season 1, Sutter has employed lots of symbolic imagery, as well as Shakespearean and biblical allusions, and it's played out beautifully in its modern-day MC translation. And I mean beautiful as in SOA has not been predictable at all, what with all of its twists (freaking JAX! and dumb Wendayyy!)
Anyway, what I'm getting at is that Sutter obviously loves playing with all of this in his storytelling: stereotypes, symbols, cliches, myths - the archetypal character of the wise, spiritual homeless person has been used in the media so often to the point of barfdom, so I'm quite confident that Sutter will also have a twist to this seemingly angelic, homeless woman.
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