I got into a car accident almost four months ago. I was driving home from school and the car in front of me braked quickly and, due to the fact that it was raining, I didn't have time to stop. I simply clipped the corner of the car, and some of the paint from my car had scraped off onto it. We called the police and it was noted that the accident was my fault. I accidentally gave the officer an expired copy of my insurance (I had the current one), but he told me not to get it and that it wasn’t a problem. I didn't get a ticket, we exchanged information (I live in Michigan – which is no-fault), and both went home.
Now, four months later, I received a letter in the mail from a law office claiming that I need to contact my insurance company, and that my failure to provide this information to my insurer may result in a lawsuit.
I'm confused. I called my insurance company the day after this happened and informed them about the accident. My insurance agent told me that the woman I got into the accident with would call my insurance company directly, and that they would inform me if she called. So I'm confused why I'm getting a letter telling me to do her work for her? Isn’t it her responsibility to contact my insurance company, not mine?
The letter itself is riddled with grammar issues, says it contains a "traffic crash report" that wasn't in the envelope, and lists the wrong insurance company as mine. I’m assuming they’re simply trying to scare me, as there’s a box at the bottom of the letter that I can tick and return that says “I had no insurance on the date of this accident.” So, I’m assuming they thought I didn’t have insurance. Now, I was told that day that I could contact the city police department for any questions regarding the accident, so I’m assuming she can also contact them and get my correct insurance company?
What am I supposed to do?

