I think she could smooth the case out herself too. But she does have to be very careful to make sure she covers all her bases. What I would do is type up a letter (make sure it's intelligent and not confusing) explaining that you filed your 2007 taxes in 2011, but you should also send evidence for 2007. In the letter you should also explain that the reason your taxes show the CA address even though in 2007 you were in GA is because the filing of the taxes was done in 2011 (which I assume you were back in CA). I would throw in an apology for this whole confusion.

I had A LOT of addresses for my application. I moved around a lot! It just came with the territory of being undocumented. I checked everything a lot though. I made sure my timeline for the addresses correlated with all the evidence I had. Specially my strongest evidence which were my bank statements. Just take everything slow and make sure you cover all of your bases. Once you have it all really ask yourself "if I was processing this evidence would I approve it?" Have the smartest person you know look it over if you are still not comfortable. If, however, you do have enough money for an attorney I would say to try that if you think you'll need the help.

I went to my bio appt today and I really, really hope I don't get an RFE. Good luck to you OP.