Jaywalking mom gets probation but opts for new trial

The jaywalking mom whose daughter was killed by a drunk driverr, after being sentenced to one year probation, has also been given the option of a new trial.

Though I am glad for the mother, I wonder how it was possible for the judge, Katherine Tanksley, to award a new trial. First she sentenced the mother to one year of probation, then offered her the option of a new trial. If the first trial was faulty for some reason, how could she pass sentence? And if it wasn’t faulty, on what grounds could she allow another trial?