This reminds me of a line from "Sex and the City". The ladies are sitting around talking about guys in general, and the conversation turns to why men don't call after it looks like a new relathionship was going somewhere. Someone says, "He's just not that into you."
I know this isn't quite the same situation, but it basically sounds like that. The two of you had some things in common, started to socialize, but, it just didn't go anywhere. If this were a really long-standing friendship and you had once been very close, I'd say, yeah, you should talk to her. But it just sounds like she's not interested in continuing the friendship. And that doesn't mean that she has any major complaint against you, or hates you, or anything like that. It just didn't turn into a really close friendship.
So, just back off, treat her kindly, as you would any neighbor. Who knows, maybe later, at a different point in your lives, you might end up good friends. Try not to take it personally.