[michigan] car question

So i lent a car to a friend in that they make the payment on the car. Was my wife’s friend they had a falling out. Now i am worried they won’t make the payments. My wife wrote up a document and we went to the bank and notarized it. Just wondering what i can or should do if they don’t make the payments anymore. Should i get a lawyer or something car is in my name so i am just wondering what to prepare for