Wow that's suck. from what I'm understand USCIS-NVC-CONSULATE have nothing with each other, every department doing their own thing. You will not be able to expedite anything with them (someone here can correct me if I'm wrong)
Timeline and family tree just bring it with you, l almost think 95% case get decision before the interview. I know it is hard that you both been waiting for all these months but you can't do anything at all. The best you can do right is get all the support documents and follow the next step by their rule, there is no shortcut or expedite so don't get yourself stress out.
My case is difference 6-months is fast, some case could see years.