US Immigration from Russia

We did a K1 and now we are both US Citizens, we sponsored Russian Mom to come here and it's approved (she will interview in Poland). What kind of interview can we expect? Her English is basic at best, she has visited for 6 months at a time.

My wife (beneficiary) has 2 kids and we are planning on having the kids immigrate later because they need to finish school (1-2 more years). My wife's case is already Documentarily Qualified and she is waiting for an interview date. We paid one AOS fee and all the cases are linked. We have not filled out any of the documents for the kids yet but we have paid the fees.

We have been told that the US Embassy won't proceed with scheduling an interview unless the kid's applications are also Documentarily Qualified. We contacted the US Embassy in Tbilisi and they told us to contact NVC and when we contacted NVC, they told us to wait for the US Embassy to schedule an interview.

Our questions are as follows:

1. How can we proceed with my wife's visa interview first without the kids?
2. If we submit all the documents for the kids, are they obligated to enter the US at the same time as my wife?
3. If we submit all the documents for the kids and they are Documentarily Qualified, can the kids choose a different interview date than my wife?

Thanks all,

We searched around Visa Journey and weren't able to find anyone in a similar situation but apologies if this is a duplicate post.

So just for context - this is not my case, but someone is a chat group that I am in, who posted:

"Anyone in the process of getting NVC approved? I'm dealing with a complete submission followed by request for resubmitted duplicate documents... I uploaded and ceac shows uploaded. I know a man who is not on this chat. He has exact same problem. Asking for already submitted documents and when he emailed a request for an update they only responded he should wait... They wanted duplicate of w2 and wife prior divorce. Also hand signed versus digital signature on the application ds260. FYI their website says to digital sign."

I have paraphrased a bit, but otherwise word-for-word what this person wrote in the chat. I've never heard of this sort of request, and I even have done an archive search of VJ and haven't found any other instances of people saying that NVC has asked for an RFE for a physical signature on the DS260. I'm wondering, did they misread something, or is it really possible that NVC wanted this somehow signed on paper? Even the PDF output of the DS260 doesn't have a place for physical signature if you wanted...

My Moscow-based girlfriend received a tourist visa and wants to visit me in the US. She must travel and get vaccinated first. What would the best place for that? Istanbul? Dubai? Israel? Ideally, we would like to find a place reasonably close to the airport where she can go, get jabbed and fly back to Moscow all in the same day. We are looking only for the Janssen/J&J vaccine since it is single dose.

Thank you in advance.

received visa and now in the US. Embassy issued cr-1 visa when they should have issued IR-1 visa. Married for more than two years when visa was issued and traveled to states.
Who do I contact to get state department/ immigration to fix this?