SVR_999,
Here is what I would suggest to do:
1- Call the USCIS, I would imagine they might have a way to resend the Interview Letter.
If the above is not possible for them to do, here is another suggestion:
- Scheudle an Infopass for your wife to be in the same day and around the same time of her interview (January, 16th).
This Infopass will gurantee that your wife will be able to enter the Distict Center (either using the Letter from the Officer or using the Infopass).
Once she enters, they should call her name as her interview is already scheduled.
At this time, she can explain to the office that she didn't receive the interview letter and that another officer gave her a letter to attend.
I believe this should work.
Good Luck.
BTW, was your wife stuck in Name Check?
Why did it take too long for your wife to get the IL compared to you?
I am in the same situation where my wife got the IL but I didn't get mine yet.
Thanks,
mimo_yyy