Dear sister,
Don't worry. My wife had an interview a few days back and alhamdulillah it was approved, as the visa officer (a Canadian lady) told us right after the interview. Since I was with her in Kabul I also went to New Delhi for the interview. I also didn't know why they requested us for an interview and was afraid that there might have been something wrong with our case. BUT NO! Ours, by Allah's grace, was fast and easy. We updated our application and brought that with us also new pictures and lots of documents for proof, like letters, facebook convos, bank statement, etc.; I think it helped. We dressed up nicely, talked politely and confidently. They did do a quick cross examination for us; whatever info they got from me at the beginning they asked my wife about it to see if we have the same answer, and we did!
PS: our interview situation was just like that of cvimm, a senior member