I've just asked her mother if she remembers the approximate month so I can put a date that's as close as possible.
So in your opinion, I won't have any problems editing it at the interview, right? I don't think this should affect my eligibility as my wife has been a US citizen for way more than the 3 years required.
Yes definitely. I need to put a date. I'm just wondering if there will be a problem for me to edit that date at the interview with the IO?