Gina,
I'm only doing R&S 2 this year, so I don't think I'll be able to help you as much as some others here. I know that we had done Abeka's 2nd grade stuff prior to this year, and we started with R&S 2. While we had some very basic stuff like nouns and verbs, my ds is really learning a lot this year with lots of coverage of pronouns, helping verbs, different adjectives. We had not covered these things nearly this well before, so I feel like it's very worthwhile for us. Now, your dd may have had much more in BJU than we did. I think from what I've seen others say, that R&S 3 does review and then jumps into diagramming. I have no clue how much they review though. I do know that HOD only reccommends being done with R&S 6 by 8th grade, so you've got plenty of wiggle room, too.
I bet someone can help you who's done level 2 and 3.

Kathleen