Coworker Threatening To Involve My Family And Insurance After I Paid Our Signed $700 Settlement In Full. What Should I Do?

Location: Michigan

A few months ago, I accidentally scratched my coworker’s parked car. I took responsibility, and we agreed to settle privately for $700.

We both signed an agreement stating that $700 was the total amount owed and that neither party could pursue further claims once the full amount was paid.

I paid the entire $700, and she acknowledged receiving it.
Recently, I told her how much paying that amount had affected me financially. I made it VERY clear that I wasn’t asking for any money back or trying to change our agreement. I just wanted to express how I felt.

She absolutely lost it. Started screaming at me at work, in front of other people, told me I should have “paid her and shut up,” and said she didn’t care about our contract.

She then threatened to go through insurance AND contact family members I had explicitly told her I didn’t want involved.

I’m an adult, and she knew from the beginning that I wanted to handle this privately. Given the circumstances, I believe she was deliberately trying to intimidate and embarrass me. She also sent me footage of me scratching her car with no additional context or captions….

For context, the vehicle I was driving was insured under a family member’s policy, and I was an authorized driver.
I have the signed agreement, proof that I paid, and messages related to the incident.

My questions are:
What should I do if she actually files an insurance claim?
Is our signed agreement enforceable in Michigan, even though it wasn’t notarized?

Could the insurance policyholder face financial consequences despite the settlement?

Does threatening to involve my family to intimidate me have any legal significance?

Would I have grounds to take legal action if she pursues additional compensation despite the agreement?

Should I consult an attorney now or wait until she actually does something?

I’m not trying to get out of paying for the damage. I already paid everything we agreed upon.
I just want to know what I can realistically do to protect myself, because I thought this matter was over.
Any advice would be appreciated.