Holder or driver’s liability?

Hello, I have a problem. The police have reported my mother for violation of the crossing ban over drawn lines. The car is admitted to my mother but has not driven. On that day, however, several different people have driven with this car and no one wants to have been (all family members). My mother logically does not want to pay if she is not forced to do so because she has not committed the violation. Now my question is as driver or driver. r Halterhaftung? With Halterhaftung the thing would be clear, with driverhaftung it sets a contradiction. Please now no discussion by itself blamed if one gives the car that she has already found out 😉