In Georgia, a parent can only be held lliable for a child's negligence under the Family Purpose Doctrine, which is law in some other states. I am not sure what the law is in Wisconsin. Under Georgia, if the parent provides the car and insures it for the child and lets her use it for family purposes and she causes a wreck, the parent could be liable. Title ownership is not a key factor, but could be one of several factors to look at. Generally, if you dont live together, and you don't provide the car to her for family purposes, you are not liable for her wrecks.
Consult a Wisonsin lawyer but this should give you an idea.
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