Thanks for the information. Sorry this has happened. The good news is that You do not have a responsibility to report the divorce to USCIS. You have not done anything wrong and there's nothing for you to get in trouble over.
It is in her benefit to report the divorce to USCIS while applying to convert her status to permanent resident through form I-751. She can do that even if she is divorced. If she does not do that, then she will lose her conditional (temporary) resident status in the US.
But again, that is up to her. There is no law or regulation that states that you must report any of that.
Good luck to you during this process and I hope this answer has helped you!
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