If you only co-signed, then you are not an owner and could not get any insurance coverage since you do not own the car. You need to check what the ownership status is. In general, the owner of a vehicle who is not driving the car at the time of the accident is jointly liable for the first $15,000 of the damages [so if your insurance pays the first $15,000 your mother would not have to pay anything].
Answered on Jul 15th, 2017 at 4:51 AM