Nope. It's regular processing. If you look at the other Windsor applicants, most of the non-routine applications are processed in 7-8 months timeframe.
I didn't take copies of expired passport. I had the color copy of all pages of current passport. But officer didn't ask for it. Also I didn't have any non-English stamps.
It's better to take your expired passports also with you. My previous passport expired in 2008, but still the officer asked for it. Luckily I had it with me for the interview.
You don't need to take your daughter for the interview. Just carry her passport and documents in case the CO wants to see them.
I did take my son's documents with me for the interview but the officer didn't ask for it.
Good Luck!