Actually, I don't know if she's "trying too hard" - it could just be that some of the lyrics are very abstract, which can work well (which it does in most cases in her music), but I remember a few times where it was just didn't make any sense at all. Can't think of them off of the top of my head.
I'm not one to care about the lyrics of a song, though, so it doesn't matter.
Let me correct that - it appears that she's trying too hard. For all I know, it comes naturally to her.