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If the cost of the school is in issue, it’s fair enough to relate the financial impact of the school to the financial impact of the car, such as not being able to pay for supporting the daughter’s car with insurance/gas/… or even requesting that the student makes a financial contribution involving saving money by letting someone else in the family use the daughter’s car while she is in school. However, the original poster didn’t mention the financial impact of the car (in the posts I saw). Instead her main concern seemed to be her daughter leaving the car unlocked and a burglar getting into the car, as she heard that such events are common on college campuses. One option for the latter might be explaining her concerns to her daughter about leaving the door unlocked, having insurance that covers theft, and researching the actual crime rates for the schools her daughter is considering (such events are not commonly reported crimes at many campuses). I don’t think forbidding the student from using her car out of fears of an unlocked door is a good solution.</p>