Ford Motor Credit Company Consumer Loan Complaint

Ford Motor Credit Company Consumer loan department,

Vehicle loan Managing the loan or lease Michigan

I am co-buyer on a vehicle for my niece which does n't communicate with me anymore. I feel threaten by Ford Credit to jeopardized my credit due to my niece not paying. I have spoken to several different service reps at ford credit. I asked if they could contact my niece to find out if shes going to pay. I also asked if they could locate vehicle because I believe she has no intentions of paying.If I have to pay than I need vehicle in my possession. How do I handle this situation?