HHH

Hi everyone, i received a letter from USCIS after my greencard interview,it requested me to either submit a i601 OR provide the evidence that i failed to depart the US for the reasons that's beyond my control. (the letter said it appears that i am inadmissible to the US under INA212(a)(6)(c)(i) for fraud or misrepresentation.) background: got married on Sep 2017 (we were in a relationship for more than an year) entered the US on Dec 2017 with ESTA i was planning on staying just a month, but my father in law got badly injured 10 days before i arrived, and my husband's grandma passed away 3 days after my arrival. my husband was the only person that makes money after his dad was injured, and he was upset and under stress so i decided to stay here for him and his family. my question is 1. Do i submit a 601 or provide the evidence that i failed to depart for the reasons that's beyond my control? 2.i have an infopass appointment next week, what can i ask to help with the situation? 3.if i chose to provide the evidence and my 485 gets denied, do i need to leave the US straight away? 4.if i apply for CR1 when i return to my country, does the previous denial record affect my future application? any suggestion is welcomed, thank you.