So after your 18 month extension period expired after the i751 did you do anything or did you just continue to wait until you got word that you need to go for your next interview?
We've already had 1 interview, and have since done biometrics, and basically at this point we are just waiting to get word on our second interview. Just not sure if anything needs to be done if our extensions for her temporary green card are about to expire... When I login to our USCIS account online the last thing I see is:
April 25, 2018
Response To USCIS' Request For Evidence Was Received
On April 25, 2018, we received your response to our Request for Evidence for your Form I-129F, Petition for Alien Fiancé(e), Receipt Number *******. USCIS has begun working on your case again. We will send you a decision or notify you if we need something from you. If you move, go to www.uscis.gov/addresschange to give us your new mailing address.