You are in error. She was not tried or charged for any offense beyond drinking at the prom. Since she was not charged or tried on those offenses, there is no way that she can serve time for them.
The website was used as evidence that she violated her probation for the charge of underage drinking at her prom - nothing more. When one violates their probation, the judge can then revisit the sentencing on the ORGINAL CHARGE. That is what happened here and the judge gave her 30 days in jail.
Close...but no cigar. She violated the terms of her sentence of probation after being arraigned before Martone on misdemeanor charges of being a minor in possession of alcohol. This gives the judge wide latitude in pronouncing final sentencing. She's lucky he didn't slap on a contempt of court charge.
A judge who sentenced three teenagers to probation for being drunk at their high school prom had them jailed after he saw them drinking and ridiculing him on a Web site one of them created....
As a condition of their probation, he ordered them not to drink and to avoid places where alcohol is served or consumed.