You green card is valid as a travel document to return to the US so long as your stay does not exceed one year. So if you return after 8 or 9 months, you should be OK. But you should also be prepared to explain and document the reason for your prolonged absence, and your continued residence in the US (lease, deed, tax records, bank account, car ownership, immediate family members, insurance, etc.).
I don't know why your case would be sent back to the NVC. Perhaps the petition was sent back to the USCIS service center for revocation or readjudication? It sounds like you would be well served to consult with an immigration attorney to review all the facts of your case.
You can try to submit your new information through an Infopass appointment in Newark, but I suspect that you will have more certainty that it reaches your file if you present it on the day of your oath ceremony. But the answer is that yes, it could delay your oath ceremony if the USCIS wants to review your circumstances in more detail first. A delay is still better than completing the naturalization and then having the USCIS revoke it later. Of the evidence you bring may be enough for them to...
It sounds like your attorney had no other choice. But generally the USCIS's position has been that a certified LCA must accompany the H-1B petition or it will be rejected. You'll have to wait and see what the USCIS does in your case.
There is no correct answer to your question because all cases depend on the specific facts of that case. First, it is important to know how your husband entered the U.S. If it was lawful, then you might be able to sponsor him for a green card and he can apply for it here in the U.S. If he entered without inspection, then he cannot apply to adjust his status in the U.S. He would need to return to his home country to apply for an immigrant visa. Because of his unlawful presence in the U.S. he...
Yes, she needs to sign her Form G-325A, Biographic Information. It is generally a good idea to submit a signed personal statement from her as well, describing how you met and decided to get engaged, and the she intends to marry you within 90 days of arriving in the U.S. You should also include such a statement from yourself.
Original documents of the copies you submitted with your application are always required. The interview letter should state that, and list examples. At the very least you need proof of the qualifying relationship and of your lawful entry to and status in the U.S. You may find it useful to arrange a consultation with an immigration attorney to review all the facts of your case and make sure that you haven't overlooked something.