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The green card is not invalid, but by operation of law, she is a U.S. Citizen and just needs the certificate to prove it and that is what the N-600 is for.
As to your questions:
1) Question 16. "Information about admission into the United States and current immigration status" A. "I arrived in the following manner"
Then they ask for the port of entry and date of entry.
1.1) Ok, we travel quite a bit so... is that the last entry? the first entry in the US? The first entry as a Green Card holder?
They want to know about the last entry. The last entry should have been another admission as an LPR. Each time one enters using a green card, they are asking to be admitted again as an LPR.
1.2) Is there a document (other than the passport) that would show this information? My concern is that it's very difficult from the passport stamp to guess what is the port of entry. Only the date is usually legible.
Remember where one entered is usually easy. It's the date that is hard. You can try here to get more information:
1.3) If I cannot find this information, I was thinking of asking the immigration lawyers who took care of my files to provide me with a copy of my file... Is that doable? Would you have any other idea to try to get this information?
That won't really help because USCIS wants to know about the last admission.
2) question 16 C "USCIS office that granted my permanent resident status or location where I was admitted". Again, how do I know how to answer this question? This is old story and I don't really remember who sent me my green card! Is this information available somewhere?
If you Adjusted Status, meaning that you filed an I-485
inside of the U.S., it is the place that you had the interview. If you got an immigrant visa
outside of the U.S. and did not do an interview in the U.S. and you just got a green card in the mail a few weeks after entry, then it is that place that you entered the U.S. on that immigrant visa. If you cannot seem to find it or remember, you can file a G-639 Freedom Of Information Act (FOIA) request and get a complete copy of your immigration file which should include the information that you seek. It is free but may take 2 to 3 months or more to process. Here is a link:
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