She's just pretending to be some mild, unassuming woman, who has lost her dear husband. Presumably, the locals would then be more likely to trust her and not think she has any ulterior motives. So if Alexandria turns out to be more than it seems, all eyes will be on someone like Daryl, or Rick, not her.
To your first question, not really. The most note worthy thing was the ending. To your second comment, doesn't the fact that Aaron comes from an established community explain his clean shaven appearance?