What if the car accident I'm being sued for wasn't my fault?

I received papers today saying that I am being sued for a car accident that happened back in September of 2018. The officer that reported the incident, did so incorrectly stating that I caused a 5 car pile-up. I know this because the SAME person suing me sent me documents a few weeks after the accident expressing that she knew this was reported incorrectly and needed me to sign an affidavit. I still have this paperwork and even the mapping of the accident where she shows it is incorrect. My first question is can she still sue me if I have all this information? Second, I am reading that the first thing I need to do is contact my insurance company and I am now with a different company so do I call who I had at the time of the incident or the one I currently have? Any other tips anyone can give me would be greatly appreciated, I have never dealt with any court cases or anything and am terrified because I do not have the money to pay for a lawyer. Please help!